The author: Dr. Donald Perkins FRMetS at the weather station but, sometimes, on expedition.

Llansadwrn (Anglesey)

Latest Diary 2020

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Logo: Llansadwrn Weather - Melin Llynnon, Ynys Môn

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    Times are GMT (UTC, Z). Observations at this station [ ] are 24-h 09-09 GMT, some others { } occasionally refer to other 24-h periods, extremes (provisional) maximum, minimum, rainfall and sunshine are usually 21-21 GMT. When averages are referred to (.) compares with the last decade and [.] with the new 30-y climatological average [1981 - 2010]. All data are subject to verification and amendment.


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    May 2018

    #StayingAtHome #lockdown

    May 1 - fine and sunny, but the 9.1C at 0900 GMT was feeling fresh in the air flow from the Greenland Sea. Pressure 998 mb was rising with a complex low-pressure system 989 mb off Wick 991 mb North Sea having an occlusion over Cumbria and W Scotland at 06 GMT, the North Sea low was 993 mb at 0900 GMT moving towards the Baltic. Ozone concentrations were down this morning level 2 at Marchlyn Mawr the same as Cardiff City centre and Port Talbot (source: Air Quality Wales).

    View of the Carneddau Mountains, Wales in #lockdown revealing a little snow.

    Mostly sunny in the afternoon the cloud lifting to reveal a little snow left on the tops of the Carneddau and Snowdon, there were a few widely spaced showers around, we caught one of rain at 1930 GMT (Edinburgh Botanic Gardens 16.1C Usk 15.1C, Katesbridge -2.1C Lake Vyrnwy 4.0C, Myerscough 12.0 mm Llysdinam 6.2 mm, St Athan 11.4h Valley 8.3h) [Max 13.7C Min 5.7C Rain 0.3 mm]. Frequent snow patches left after recent snowfall.Fine and sunny on the 2nd with pressure 1011 mb rising. Low 1001 mb was on the move off Aberdeen over the North Sea heading for S Sweden. We still had a cleaner fresh Polar air flow, there were showers affecting the western fringe, but they kept away from here. Sunny and feeling warmer in the afternoon Kew Gardens 18.0C Usk 16.7C, Katesbridge -0.4C Usk 1.5C, Scarborough 4.8 mm Cardiff 3.2 mm, Prestwick 13.9h Valley 10.9h() [Max 14.3C Min 3.9C Rain nil]. On the 3rd there were bands of decaying frontal cloud across Wales to Kent. A little sunshine early in the day before becoming mostly cloudy by 0900 GMT, visibility was excellent. Possible moss carder bee on comfrey in our Garden at Gadlys.There was a more active system 1008 mb off SW Ireland with a front over the Severn estuary, Scotland and NE England also had some cloud. Pressure here 1016 mb was rising and the day became brighter, sunnier and warmer by afternoon. There were several bumble bees on the flowers and particularly attractive was a bed of comfrey. Several possible moss carder bees Bombus muscorum with ginger-coloured thorax were feeding. There was one red-tailed bumble bee, but I did not manage to get a photo. There was a fair amount of traffic in both directions past the weather station, the Britannia Bridge, however, was deserted (Carlisle 17.7C Hawarden 17.2C, Kinbrace -6.6C, Pateley Bridge 14.6 mm St Athan 2.6 mm, Morecambe 13.8h Valley 8.2h) [Max 15.6C Min 6.2C Rain nil]. A fine morning on the 4th after a mostly clear night the 3 oktas cumulus cover reducing at 0900 GMT. Pressure 1021 mb was steady with high 1027 mb S Iceland to NW Scotland. Frontal cloud associated with low 992 mb W FitzRoy was affecting southern Britain. Cloud was also affecting coastal areas NE England and there was early mist in central England. The best sunshine and highest temperatures were here (Porthmadog 20.1C, Kinbrace -3.0C Capel Curig -0.4C, Aviemore 8.2 mm Tiree 14.3h Valley 14.1h hours) [Max 16.1C Min 4.9C Rain nil]. Another almost cloudless morning on the 5th, but the was a stiff E'ly breeze stirring the trees. Visibility was very good and it was 10.7C and 68% RH. Sunny. Jets from RAF Valley were around and occasionally fly over the weather station, and I could here the buzzing of the Texan T1 advanced turboprop trainers, currently fling over the SW corner of the island, used to prepare pilots for Advanced Flying Training on the Hawk T2 jets (Porthmadog 18.6C, Kinbrace -3.9C, Culdrose 33.6 mm, Dundrennan 14.3h Aberdaron 14.3h Valley 13.5h hours) [Max 16.1C Min 6.9C Rain nil].

    I tried to find a bit of cloud somewhere in the sky on the 6th, but there was none. It was sunny and dry, all surfaces that I record, very good visibility and it felt a little warmer, the 14.2C at 0900 GMT very pleasant indeed. With pressure 1015 mb would rise and we were within UK high 1028 mb centred near Newcastle.Asphodelus alba in flower in our garden at Gadlys.Sunny except for Cornwall that was under an occlusion over the Celtic Sea. The attractive white Asphodel Asphodelus alba is flowering in our garden (left). A native of southern Europe from Spain to Greece. It's hardy, we have seen at altitude in the Pyrenees as well. Worked on the veg plot to get it ready for planting out lettuces raised in modules. Enjoyed a cool beer afterwards () [Max 18.8C Min 5.2C Rain nil]. On the 7th pressure 1021 mb was falling as low 998 mb over the Atlantic SW of Ireland had frontal cloud affecting the western fringe, 7 oktas cover recorded, visibility very good. There was a shower trough over the Severn and Pembrokeshire. A temporary S'ly air flow meant we had warmer conditions with 16.4C at 0900 GMT. Ozone was on level 4 here and level 2 in Cardiff. The sky had cleared by nightfall and the near super moon, last of the year, was up over the mountains at midnight, a sea fog had encroached and this resulted in an eerie glow () [Max 20.7C Min 8.4C Pptn trace]. The 8th was the 75th anniversary of the ending of World War II. Both of us were old enough to remember the events of the day with prime minister Winston Churchill broadcasting to the nation at 3 pm, and an address by King George at 8 pm in the evening. It has been weird seeing these old films broadcast on television today as. We did not have television in those days, we never saw them, it was radio then and of course broadsheet newspapers, the latest editions having very large banner headlines, THE WAR HAS ENDED. We took part in Street Parties, not on the 8th that was a Tuesday a working and school day, but on a later date when when the best spread that could be produced with wartime rations was put on the tables in the middle of the road. ITweet about 75th anniversary of VEDay ...It seems that there were some nice looking jam tarts at the one I was at in Sketty, Swansea, South Wales. My wife all dressed up, in clothes made by her mother, was in Hove, Sussex. A bright morning with thinning cumulus clouds and high cirrus, the fog had cleared and visibility was good; grass was wet with dew and fog deposition with a trace on the raingauge funnels. A little more cloud around noon then clearing giving a mostly sunny end to the day (Kew Gardens 24.5C, Katesbridge 3.4C, Drumnadrochit 20.2 mm, Bournemouth 13.4h Bala 11.5h Valley 10.9h) [Max 20.7C Min 9.7C Rain nil].

    The 9th dawned bright and with a light NE'ly breeze soon warmed up when the sun had risen enough above the mountains and our local tall trees. At 0900 GMT it was 17.1C, a shirt sleeves morning for the obs, very pleasant. Pressure was on 1014 mb we were in a slack area of low pressure 1013 mb Western Isles, between highs 1032 mb N Greenland and 1020 mb E Med. Some cloud was lying far to the north-west. Pink Rhododendron starting to bloom in our Garden at Gadlys.Mostly sunny through the day, some cumulus clouds developed in the afternoon S of the Snowdonia Mountains and were towering for a while. Thunderstorms developed in S Wales and localised flash flooding affected streets and property in Carmarthen and Gorseinon, moving north-eastward missing N Wales. We held our street party complete with jam tarts #StayingAtHome in the sunny afternoon joining family and friend on Zoom doing the same at Newcastle, Llanfairfechan, Wilmslow, Salford, Ramsgate and Ashdown in Kent. The weather station communications hub stood up to the pressure despite the still dodgy land-line broadband here. Rather warm in the south, but we had the most sunshine (Northolt 24.9C Cardiff 24.6C, Shap 2.0C Capel Curig 4.6C, Keele 19.8 mm Llysdinam 5.6 mm, Valley 14.4d) {Max 21.4C Min 9.8C Rain nil]. A fine and bright morning though fairly cloudy morning on the 10th as altocumulus and cirrus clouds increased. We had an opening in the cloud cover overhead the station in a strong NE'ly wind the airflow coming from the Svarlbard region. The temperature 11.5C rose to 12.4C at 0923 GMT, from then it was colder. Gusty winds in places Warcop 47 mph, St Bees 43 mph and Donna Nook 40 mph. Becoming overcast by afternoon with spots of rain that just about wetted the ground about 15 GMT. Blue Iris and Asphodelus alba in bloom in our Garden at Gadlys.Gorwel Heights in Llanfairfechan recorded 0.6 mm (Plymouth 23.0C Milford Haven 21.0C, Fair Isle 4.9C Lake Vyrnwy 9.6C, Lerwick -1.6 C, Coningsby 10.4 mm S Athan 0.2 mm, Tiree 13.7h Aberporth 8.0h Valley 4.7h) [Max 12.4C Min 8.8C Rain trace]. The breeze had strengthened overnight, and on the morning of the 11th it was a force 5, the ground was strewn with leaves blown off the sycamore trees. With airflow from the Svarlbard region it was feeling cold too, the temperature at 0900 GMT 6.8C up from a minimum of 4.2C with a 3C wind chill. On Snowdon a temperature of -2C and a -11C wind chill could be expected. Pressure 1026 mb was rising with high 1036 mb just S of Iceland. A cold front was working it's way south over Scotland where it was wintry with snow showers. There was a low 996 mb over central France with a cold front over Brittany. There was an occlusion over SW France, a red alert for heavy rain had been issued for the region and about 12 cm of snow had fallen on the Pyrenees. There were strong winds in East Anglia and Thanet, Langdon Bay gusting 52 mph and Manston 41 mph. 'Ne'er cast a clout till May be out' is an old proverb, clout meaning clothes. The earliest citation is this version of the rhyme from Dr. Thomas Fuller, Gnomologia, 1732, although it probably existed in word-of-mouth before then. Good advice as I have had to return to winter clothes after changing to shorts and tee-shirt (Bournemouth 14.2C Pembrey Sands 13.5C, Fylingdales 7.2C Capel Curig 7.9C, Tulloch Bridge -5.2C Bala -0.6C, Resallach 2.6 mm, Dundrennan 14.7h Aberdaron 14.5h Valley 13.9h) {Max 10.4C Min 4.2C Rain nil].

    A chilly night with some clear sky there was slight white frost on the fields at dawn on the 12th, the grass minimum read -2.7C, no airfrost here the minimum 2.0C, but Mona airfield recorded -1.3C. Tweet about our garden flowers ...Mostly cloudy at 0900 GMT and light breezes SE'ly here, but generally NW'ly, visibility was very good. Pressure 1023 mb was falling, high 1032 mb SE Greenland ridge towards Shannon and lows 1007 mb N Italy and Iberia. With a cold front over the Scottish borders there were a few showers in the west. Fine, dull and cool, The road was fairly quiet only 2 cars in 30 minutes. The afternoon turned out sunny and with lighter breezes more pleasant. Potting on tomato plants for planting on veg plot in June when weather is hopefully warmer (St James Park 16.3C Usk 15.2C, Sennybridge -4.7C Mona -1.3C, Fair Isle 8.8 mm, Bude 14.3h Aberdaron 12.2h Valley 8.8h) [Max 12.2C Min 2.0C Rain trace]. The 13th began very fine after a minor cold front passed southwards, now sunny with lines of cumulus clouds over the Snowdonia Mountains. The band of cloud was now lying over the SW across to the Thames estuary with cleaner air from the S of Iceland today visibility was excellent. There was a spot of precipitation in the raingauge bottle and a significant deposition of dust on collecting surfaces. There may have been some Saharan dust mixed with local dusts. Quiet apart from an RAF Texan aircraft from Valley somewhere in the skies over Anglesey. Pressure was on 1020 mb with high 1028 mb S Iceland. Today potting up chrysanthemum cuttings that had rooted around the edge of 3 in clay pots using 50/50% mixture of loam and vermiculite. Clay pots are essential, cuttings don't root well in plastic pots. Did my 1 mile #lockdown walk around the garden and wood, some bluebells have faded where the canopy is densest, there was still a good show at the 'far end' where less leaves have emerged. The garlic is still good with masses of flowers. The best weather today in NW Wales (Porthmadog 15.0C, Tulloch Bridge -5.0C Sennybridge -2.3C, Killylane 2.4 mm Rhyl 1.6 mm, Valley 13.5h) [Max 11.2C Min 4.7C Rain nil]. A fine day on the 14th beginning with broken cloud and light cool airs mainly from the nor'east. There were some cumulus clouds increasing and hardly moving across the sky. Pressure steady on 1026 mb within the Atlantic high 1028 mb off Malin Head drifting northwards. A warm front over Scotland associated with low 1012 mb Norwegian Sea gave some showers in the Highlands. Took cuttings of late flowering varieties of white chrysanthemums and did my mile #lockdown walk. A clearing sky in the afternoon and clear evening (Leeming 16.7C Llysdinam , Fair Isle 9.2C Aberporth 10.9C, Katesbridge -6.1C, Loch Glascarnoch 4.2 mm, Aberdaron 15.0, Valley 14.3h) {Max 12.8C Min 2.3C Rain nil]. A mostly cloudy morning on the 15th, but under the cloud visibility was very good. There was a cool nor'eastly making the 10.7C feel chilly. Pressure was steady on 1026 mb with Atlantic-low 1030 mb off SW Ireland. The cloud was due to a remnant warm front no going anywhere at all along the western fringe, so the day was dull and sunless here. Sunny in southern Britain and the north-east. Planted out 2 rows of lettuce raised in modules and hoping with the dry weather the slugs will keep away. Watered in and protected with wire netting to keep off pheasants (male with 3 females in tow) and rabbits the latter not seen this year, yet. Not nice enough for my cup of tea in the garden this afternoon (Heathrow 19.6C Cardiff 16.9C, Santon Downham -3.4C Sennybridge -2.5C, Altnaharra 5.2 mm, Shoeburyness 14.9h St Athan 13.9C Valley 0.4h) [Max 12.9C Min 4.9C Rain nil].

    Temperatures have been below average during the first 15-days of the month and very dry with rainfall of just 0.3 mm. The mean temperature 10.5C (-1.1) & [-1.2] less than in April. No air frosts, there had been 3 ground frosts.

    A much nicer day on the 16th beginning with scattered cumulus and high cirrus clouds. Visibility continues very good and all surfaces were dry, except the lysimeter that was wet with guttation droplets. AWS temperature and pressure record for pasr 28-days.Fine and sunny in fact better than the forecasts had indicated, I'm not complaining. In the sun it felt warm the 12.9C at 0900 GMT rising to 15.9C in the afternoon. At Gorwel Heights a temperature of 17.1C was recorded. Pressure was 1025 mb in a ridge from Brest high 1028 mb stretching towards the Irish Sea. Not so lucky in Scotland where a cold front associated with low 982 mb Norwegian Sea was delivering showers. The south-west Channel coast of England was also cloudy. The temperature record indicates the sawtooth pattern we have experienced for the past 28-days. The pressure record shows the deep 987 mb low that upset the apple cart at the end of April. Replanted a nice red-stemmed spring flowering Drimys (poss. Tasmanian D. lanceolata) that had been hospitalised. One has grown well now 6 ft tall on our slightly acid soil the other did not. Dug up it was trying to grow in brick waste contaminated soil, so repotted in clean soil, and it has recovered although only 1 ft tall. Also started preparing ground for sweetpeas raised in pots. I thought it so nice in the sun in the late afternoon that I fired up the barbecue and cooked steaks, could not persuade the head gardener to eat out in the garden, the then 12C not yet warm enough it seems (Pershore 19.2C Usk 17.6C, Baltasound 5.7C Aberporth 13.2C, S Newington 1.1C, Achnagart 6.6 mm, Camborne 11.6h Valley 10.3h) [Max 15.9C Min 7.4C Rain nil].

    Very fine and sunny on the 17th and with slight haze good visibility. Pressure 1023 mb was falling slowly with high Brest and lows 998 mb Norwegian Sea and 991 mb S of Greenland. Frontal cloud over N and NW Scotland with some rain. Here fairly breezy with cumulus and cirrus clouds, warm in the sun kept dry (Holbeach 21.1C Hawarden 18.9C, Kirkwall 8.6C Capel Curig 13.4C, South Newington 1.3C, Dunstaffnage 15.4 mm, Tibenham 12.8h Aberporth 3.8h) [Max 16.3C Min 8.6C Rain 0.3 mm]. The 18th was a very dull day under thick cloud at 0900 GMT solar radiation was was just 120W, a far cry from recent mornings,also thick enough for slight rain and drizzle with 0.3 mm measured. Recorded the ground as wet this morning, the first time in 15 days. A patch of showery rain was slow-moving over Anglesey. Showers also NW Britain although the SE was sunny. Light showers in the morning. It was 33C in Greece; overnight minimum of 10.1C around 03 GMT, 10.9C at 0900 GMT rising to 11.8C at 1826 GMT. Total rainfall here this month 3.0 mm, so far (Cavendish 24.6C Usk 19.1C, Lerwick 7.9C Capel Curig 10.9C, Baltasound -1.0C Libanus 7.2C, Achnagart 24.8 mm Capel Curig 5.2 mm, Exeter 13.3h St Athan 8.8h Valley 0.0h) [Max 12.0C Min 10.1C Rain 2.4 mm]. A dull breezy morning on the 19th after some light showers in the night. Recorded the ground as wet again this morning and despite the rain there were still cracks in the surface. The temperature had been 12.0C at 0833 GMT, the highest of the past 24h. Pressure 1023 mb was rising , the high 1027 mb over Brittany was diminishing. Low 995 mb S of Iceland had a frontal triple point over Scotland. Slowly a little less dull, no more rain, and by afternoon some sunny spells developing. Up to 8 May there have been 174 cases of COVID-19 recorded in Anglesey and 12 attributed deaths (St James Park 26.2C Usk 23.1C, Altnaharra 1.8C, Blencathra 19.0 mm Capel Curig 1.0 mm, Wellesbourne 13.4h Aberporth 13.0h Valley 3.6h) [Max 16.3C Min 10.6C Grass 10.2C Rain nil].

    The 20th began very fine, sunny and warm. Tweet about our garden Mediterranean Cistus collection ...There had been a slight dew formation the temperature on the grass down to 3.8C, there was heavy guttation on the lysimeter grass. Tweet about wilting sycamore trees and the drop of rain ...Cirrus clouds 3 oktas and visibility very good and clear. Conditions remain very dry, the cores off soil sampled today looked very dry, some powdery. Soil moisture was 24.8% dm under grass and on the met plot 13.5% below the permanent wilting point for the local soil type. In the afternoon the leaves of mature sycamore, wild cherry and horse chestnut were wilting. Native beech and ash seemed unaffected. There was a Föhn breeze late in the afternoon the relative humidity falling to 43% and the temperature in the Stevenson screen reading 21.9C at 1600 GMT. A pleasant evening, fired up the BBQ. Hot weather in the south (Santon Downham 28.2C Llysdinam 25.2C, Baltasound 9.8C Aberdaron 17.3C, Shap 4.2C, Dunstaffnage 1.6 mm Tredegar 0.2 mm, Morecambe 15.1h Hawarden 14.3h Valley 13.8h) [Max 21.7C Min 8.4C Grass 3.8G Rain 3.1 mm]. Meteosat MSG image (c) EUMETSAT at 12 GMT on 21 May 2020, courtesy of Ferdinand Valk.A mostly cloudy sky after recent showery rain on the morning of the 21st with sunny spells developing. Pressure 1021 mb was rising as low 967 mb tracked northwards west of Ireland, a cold front over the Irish sea at 06 GMT had moved eastward. The unseasonably low depression was an unwelcome sight at this time of year, although we could do with some rain to slake the parched soil. Derek Brockway BBC Wales weatherman.It was fine and sunny in SE England, hot in Ramsgate, here on the western fringe were some showers while there were more active showers over East Anglia with sferics observed. Fine and sunny in the afternoon. Derek Brockway the BBC Wales Weatherman featured the low 6 mm of rainfall in Llansadwrn this month to yesterday, compared with the average of 62 mm, in the 6.30 pm news bulletin (Manston 27.8C Usk 23.8C, Eskdalemuir 1.4C, Stornoway 7.4 mm Mona 2.2 mm, Reading University 11.8h Aberdaron 8.5h Valley 7.0h) [Max 19.1C Min 11.2C Rain 5.8 mm]. After midnight on the 22nd there was a spell of moderate to heavy rain that added 5.8 mm to the month's total that now stands at 11.9 mm, still a very low total for May and well below the average. A very windy day blowing strong to gale force, a gardener's gale to boot, we had tied up what plants we could on the forecast and in fact damage was minimal, the most damage were the green leaves and twigs broken off the trees that were strewn on the ground. Valley reported gales at 12 and 13 GMT and gusts up to 52 mph, we had 42 mph here and at Gorwel Heights in Llanfairfechan. Used a hard-hat to go out to do the obs at 0900 GMT, not pleasant, a lot of debris flying around and the woods were out of bounds. There was a very rough sea at Rhosneigr and there were waves generated on Llyn Tegid, Bala. Gusts of 60/70 mph were recorded in parts of coastal western Ireland. The temperature had reached 19.1C at 1353 GMT then fell to a low of 13.2C at 1800 GMT before rising again a SSE'ly Föhn-enhanced to 19.2C (screen) at 2230 GMT with relative humidity down to 41%. The day's minimum was at 0448 GMT next morning. In all an interesting day's weather (Heathrow 23.2C Cardiff 18.7C, Kinbrace 6.3C, Achnagart 73.4 mm Capel Curig 12.8C, Aberdaron 13.8h Valley 12.6h) [Max 19.2C Min 11.2C Rain 5.8 mm].

    A very windy morning on the 23rd the SW'ly force 5/6, but fine and mostly sunny. Pressure 1015 mb was rising with low 976 N of Scotland, pressure was high near Cap Finisterre 1032 mb. There were scattered showers in the north and also south Midlands. Here blustery sunny spells and a slight shower in the afternoon (Weybourne 20.1C Bodelwyddan 16.6C, Dalwhinnie 4.9C, Achnagart 68.2 mm Lake Vyrnwy 11.6 mm, Reading University 11.4h St Athan 10.1h Valley 7.0h) [Max 14.9C Min 9.9C Rain trace]. Fine, but dull on the morning of the 24th, moderate visibility and quite hazy. Very dry, a bit breezy and as a result feeling chilly although 13.1C at 0900 GMT. The afternoon was brighter with some sunshine and the temperature rose to 17.4C. Sowed runner beans (Moonlight) in pots in the greenhouse, made sure they were in the propagating frame so that the mice did not find them. We have woodmice permanently in and out of the greenhouse and they love seeds. Small bumblebees were attracted to this very small flowered figwort in the garden.The broad beans on the vegetable plot have a good lot of flowers and the bumblebees are taking some interest in them. A number of small bumblebees were attracted to a very small flowered figwort (left) growing in the garden and ignoring the broad beans. Had family Zoom meeting everyone except one NHS keyworker in #lockdown (Teddington 23.5C Usk 20.5C, Aviemore 7.1C, Keswick 8.8 mm, Almondsbury 12.3h Aberporth 12.0h Valley 6.7h) [Max 17.4C Min 10.9C Rain nil]. . Very fine on the 25th, continuing the dry spell all monitored surfaces dry. Just one or two cumuli seen at 0900 GMT, very good clear visibility, breezy and sunny, high solar radiation 1009 W m -2 for this time in the morning. Pressure was steady on 1034 mb with the high 1035 mb centred over Somerset. Isobars were tight over N Scotland with low pressure 983 mb SE Greenland and SW Iceland, breezy in the NW and sunny almost everywhere. The maximum at Gorwel Heights today was 21.2C (Teddington 26.6C Cardiff 23.1C, Aboyne 0.0C Swyddffynnon 0.4C, Harris Quidnish 2.6 mm, Shawbury 15.0h St Athan 14.8h Valley 12.3) [Max 17.6C Min 8.4 Grass 2.0C Rain trace].

    It was a rather murky morning on the 26th with poor visibility, moderate haze with fog reported in places including Aberporth. The sky was overcast with altostratus cloud and the grass damp, there was a drop of precipitation in the raingauge bottle. Pollution levels were low, there was a patch of Saharan dust over Britain (SKIRON Model University of Athens) and there was a dusty deposition likely a mixture of local and Saharan dusts. Pressure was high 1037 mb over the Scilly Isles, and here 1037 mb rising, a plume of warmer air was encroaching southern Britain where hot and sunny. There has been a complete absence of house martins and swallows here, numbers seen had decreased last year. Heavy losses have been reported on migration routes this year. Climatic changes in the swallows' African winter quarters and on migration routes may be having a serious impact. Research has shown that swallows are returning to their breeding areas in poor condition and are laying fewer eggs than previously. Independent of weather-related fluctuations, there have been widespread declines in swallow numbers across Europe since 1970 (Kew Gardens 26.9C Usk 23.8C, Tulloch Bridge 4.0C, Tyndrum 1.6 mm Gogerddan 0.2 mm, Exeter 14.6h St Athan 14.1h Valley 5.6h) [Max 17.6C Min 11.2C Grass 7.9C Rain nil]. Very fine and sunny on the 27th, very dry conditions with no sign of rain any time soon. Warm, 16.7C at 0900 GMT rising to 21.7C in the afternoon. Pressure steady on a high 1038 mb centred on Malin Head (1039 mb at midnight) covering a large area of Europe and north Africa. Cloudy to the N of here, but cloudless skies over much of eastern Europe, France and Iberia. Planted out sweet peas grown in pots in the greenhouse and potted up chrysanthemum cuttings (Heathrow 26.3C Usk 25.3C, Shap 1.0C Capel Curig 3.4C, Stornoway 2.4 mm Wales nil, Nottingham 14.7h St Athan 14.2h Valley 13.4h) [Max 21.7C Min 7.9C Grass 3.7C Rain nil].

    Herbaceous border in our garden at Gadlys.

     

    White French rock rose flowering well in our Garden at Gadlys.It was much of the same on the 28th, very fine, warm and sunny, ideal for a trip out, walking, perhaps the beach. All of this unlawful due to coronavirus #lockdown, we are missing recording the plants appearing at the botanical sites we usually visit #StayingAtHome. High 1037 mb now over the North sea dominating the weather, pressure here 1033 mb. A few clouds mostly cirrus and contra, just one or two contrails from jets passing overhead on route B1 probably transports from North America. The temperature at 0900 GMT 21.7C 59% RH, and dry dry dry. Did 5 laps of the garden and wood today keeping up my 1 mile a day effort to keep fit. The scented deciduous Azalea and Halimocistus sahuccii French rock rose, a dense, low-growing dwarf evergreen shrub with narrow, dark green leaves and pure white flowers 2.5 cm in width, with yellow stamens, gave much pleasure each time I passed by (Leuchars 25.7C Trawsgoed 25.5C, Ravensworth 2.3C, Resallach 17.8 mm Wales nil, Weybourne 15.1h Aberdaron 14.8h Valley 13.9h) [Max 23.2C Min 11.7C Rain nil]. Thrush taking a drink from an old pig trough in our Garden at Gadlys.The 29th began very warm and sunny with excellent visibility, with a few high cirrus clouds. The temperature at 0900 GMT was 21.9C with an RH of 47%. The exceptional dry conditions continue comparable with Greece that currently has similar temperatures. Pressure was high 1033 mb over the eastern North Sea and here 1027 mb. Helped by a warm plume of air from the region of the Canary Islands and Western Sahara the temperature here reached 25.3C at 1340 GMT. Sunny and warm on the western fringe today (Kinlochewe 28.0C Gogerddan 26.1C, Lerwick 11.3C Libanus 21.2C, Santon Downham 2.9C Usk 5.9C, East Malling 0.2 mm, Morecambe 15.5h Aberdaron 15.1h Valley 14.5h) [Max 25.3C Min 12.8C Rain nil]. Very fine and warm again on the 30th the temperature 20.7C RH 55% at 0900 GMT, one could get used to this weather. Pressure was on 1923 mb with high 1036 mb central Norway. Clean airflow from Arctic regions of Svarlbard, North Cape and the Baltic ensured excellent visibility. Sunny everywhere the temperature in Altnaharra, Scotland currently was 24C while in Manston, Thanet it was 18C.Thrush taking a bath in old pig trough in our Garden at Gadlys. The temperature here rose to 25.4C at 1533 GMT, the highest of the month (Kinlochewe 27.5C Porthmadog 26.2C, Fair Isle 12.3C Lake Vyrnwy 20.8C, S Newington 2.6C Sennybridge 4.8C, Thorney Island & Valley Trace, Morecambe 15.7h Aberdaron 15.2h Valley 15.1h) [Max 25.4C Min 12.5C Rain nil]. After a mild night air minimum 13.9C it was a cloudless morning on the 31st, very fine, but a little cooler the temperature at 0900 GMT was 17.5C RH 65%. Visibility was very good with slight smoke haze. High 1035 was little changed over Norway and here pressure was steady on 1023 mb. Very dry conditions, some brown patches were developing on grassy area, some mature trees were showing signs of wilting and roadside verges looked more like the Autosoleil in the S of France. Sunny with the UK almost cloudfree everywhere. Hot in Porthmadog 28.0C, cooler Llanfairfechan 22.7C. There were thunder storms in Morocco, NW Spain and the eastern Mediterranean (Porthmadog 28.0C, Fair Isle 13.2C Lake Vyrnwy 21.4C, Braemar -1.3C, Insignificant rain, Kirkwall 16.6 Aberdaron 14.9h Valley 14.4h) [Max 22.6C Min 13.9C Rain nil].

    A sunny, warm and very dry month. The rainfall total of 11.9 mm, (17%) & [19%], was least on record in May in Llansadwrn records back to 1928. Sunshine at RAF Valley was most in May in Anglesey records back to 1931. Temperatures above averages, the mean highest since 2017 was 12.7C (+1.1) & [+0.9] ranked 7th in station records since 1979..

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    June 2020

    #StayingAtHome #lockdown

    June 1 - a very fine and warm day, cloudless sky very clear visibility, a continuation of the remarkably fine weather of May, but I expect we will pay for it soon, the forecast charts don't look promising from midweek. Pressure was on 1025 mb with high 1033 mb S Norway. Sunny and warm out of the NE'ly breeze. The temperature at 0900 GMT was 18.0C with 59% RH excellent for drying the washing and getting on with those jobs in the garden (Porthmadog 27.6C Aboyne 1.1C High Mowthorpe 0.2 mm Waddington 15.6h Aberdaron & Valley 15.5h ) [Max 21.1C Min 12.3C Rain nil]. Just a little cloud on the morning of the 2nd, low hiding behind the Snowdonia Mountains to the south. Warm again 20.4C at 0900 GMT and continuing warm, rising to 23.9C was very pleasant in the garden. We keep susceptible plants watered and where necessary on the vegetable pots. Leaves on mature woodland trees show a little wilting in the drying breeze. We could do with a drop of rain, but not the end of the summer. Pressure 1022 mb with low 1020 mb S Iceland and a cold front over N Scotland associated with low 1001 mb Svarlbard, expected to move south. Made the most of the lovely summer day, the last for a while Gosport 26.9C Ravensworth 2.9C Strathallan 13.4 mm Bournemouth 14.6h St Athan 14.1h Valley 12.1h() [Max 23.9C Min 11.9C Rain 2.8 mm]. Well we had the drop of rain after midnight on the 3rd that by the morning had accumulated just 2.8 mm measured in the raingauge at 0900 GMT. A change in the weather with colder air introduced from the north overcast sky with a frontal system over Anglesey. A dust deposition, local plus some Saharan dust was possible, being cleared away south-eastwards during the day. Poor conditions prevented any outside work, a clearance from 5 pm brought a little sunshine to end the day. The maximum 12.1C was lowest of the month (Cavendish 20.9C Whitechurch 16.8C, Altnaharra 4.9C, Shap 19.2 mm Hawarden 18.6 mm, Magilligan 11.5h Valley 4.3h) [Max 12.1C Min 11.3C Rain 2.9 mm]. Overcast sky again on the morning of the 4th with a slight shower of rain at 0900 GMT. Pressure was on 1007 mb with complex lows 996 mb Netherlands and frontal-wave 999 mb SW Norway. A cold front was clearing over the Dover Strait into France. Pressure was high 1030 mb over the Atlantic to the W of Ireland. Dull all day, sunless here (Murlough 18.6C Cardiff 16.7C, Aboyne 1.3C Sennybridge 2.4C, Drumalbin 17.0 mm Sennybridge 3.0 mm, Kirkwall 6.1h St Athan 1.9h) [Max 15.4C Min 8.7C Rain trace], A bright start to the 5th with broken cumulus clouds (7 oktas cover) solar radiation was 809 W m -2 much being reflected back by the clouds. The temperature was 11.4C (RH 70%), pressure steady on 999 mb with low 984 mb over the Norwegian Sea. There was a cold front over the English Channel and here a cold NNW'ly breeze. Sunny spells in the afternoon, solar radiation brightness reached 1116 W m -2 at 1300 GMT with the cumulus clouds persisting (Bournemouth 19.2C Cardiff 17.7C, Redesdale 2.0C, Hull 24.4 mm Sennybridge 9.8 mm, Shobdon 11.7h Valley 10.4h) [Max 15.2C Min 7.7C Grass 3.8C Rain 0.4 mm].

    A colder and wet breezy day on the 6th with poor to moderate visibility in slight drizzle. Pressure on 998 mb was slowly rising with low 982 mb over the North Sea off Tynemouth. There was a frontal-wave triple point over Morecambe Bay. Pretty windy elsewhere with gusts of 52 mph reported at Loftus, 45 mph at Malin Head and 43 at Aberporth. Brighter and drier in the late afternoon (Pershore 19.3C Hawarden 16.0C, Libanus 3.8C, Drumnadrochit 42.6 mm Capel Curig 30.4 mm, Hawarden 8.9h Valley 1.0h) [Max 13.9C Min 7.0C Grass 2.8C Rain 0.9 mm]. Pressure 1010 mb was rising on the 7th with filling low 997 mb southern North Sea near the Netherlands coast. Overcast with spots of rain and drizzle and moderate to good visibility. The morning became dry by 10 GMT and the afternoon was bright with spells of sunshine developing later as the sky cleared. There was a bright moon seen over the mountains just before midnight (Wiggonholt 20.5C Usk 20.3C, Shobdon & Usk 3.4C, Fylingdales 16.4 mm Cardiff 3.4 mm, Prestwick 10.6h St Athan 8.0h Valley 6.3h) [Max 16.1C Min 9.6C Grass 8.7C Rain trace]. Cool overnight under clear sky with a minimum 6.2C and 1.8C on the grass. Fleabane Erigeron glaucus growing on the rockery bank in our Garden at Gadlys.A mostly cloudy morning on the 8th, but with the sky clearing it was fine and becoming brighter with weak sunshine. Visibility was good with moderate haze. A mostly sunny afternoon and a dry day (Hereford 20.0C Cardiff 19.5C, Tulloch Bridge -1.9C, Cardinham 17.4 mm Usk 9.2 mm, Stornoway 15.1h Aberdaron 14.7h) [Max 16.8C Min 5.9C Grass 1.8C Rain nil]. It was fine but fairly dull on the morning of the 9th with good, hazy visibility. There was weak sunshine at 0915 GMT the sun not breaking through. Pressure was steady on 1021 mb with high 1022 mb over the North Sea off the Lincolnshire coast. Low 1001 mb SW Iceland had frontal cloud off NW Ireland and Scotland. Had to put water on our Crinodendron hookerianum tree, known as the Chilean lantern tree, an evergreen tree with leathery, dark green leaves of the family Elaeocarpaceae. It is endemic to Chile, where it occurs from Cautin to Palena. It grows near streams and in very humid and shady places. Our 15 ft tall branched tree is full of crimson lanterns about 1 inch long in leaf axils, but suffering somewhat this year due to the dry weather. Normally there is enough rain and humidity in northwest Wales for it to grow happily so I felt a helping hand with hose pipe was necessary. A sunny and dry afternoon (Wisley 20.8C Cardiff 20.0C, Redesdale -0.5C Swyddffynnon 0.9C, Lough Fea 7.2 mm, Lerwick 15.9h St Athan 10.6h) [Max 15.2C Min 6.9C Rain 0.3 mm].

    A recent light shower of rain on the 10th did not wet the soil surface, but dampened the concrete and grass. Signs of the mostly cloudy sky opening up with a little brightness, then thickening and closing again. Pressure 1014 mb was falling with a low closeby over the North Channel at 0900 GMT. Occlusion cloud over the Irish Sea and a lot of rain at Mumbles near Swansea. There was high-pressure N of the Azores 1033 mb and Norwegian Sea 1027 m b. Little in the way of any sunshine, more at Tiree island not far to the north-west of Anglesey. Showery rain in the evening (Manston 17.5C Porthmadog 16.8C, Castlederg 5.6C, Mumbles Head 49.0 mm, Tiree 5.6h Valley 2.0h) [Max 16.6C Min 10.1C Rain 4.0 mm]. AWS temperature and solar radiation record for the 11 June 2020.Having remarked previously (26 May) about the absence of housemartins this year a group of about 20 was spotted on the 11th in the sheltered corner of the field adjacent to the weather station. There was a stiff NE'ly breeze strengthening through the day and the birds were in the sheltered working low over the cattle grazed pasture. They were flying towards the house and inspecting the eaves. They were joined by more later in the day. No swallows though, one was seen in the village on the 10th. Overcast and very dull although pressure 1017 mb was rising with a low 995 mb over Brittany and frontal occlusion stretching from the Isle of Man, Wales to Brighton on the south coast of England. A crazy temperature profile today a mild 12.4C at 0900 GMT rising to 12.8C then a cold spell falling to 10.8C at 13 GMT with rain before rising to a maximum of 16.0C at 1506 GMT after the sun had come out and a minimum 10.6C at 2126 GMT. Heavy rain SW and central S England and S Wales again. Tiree sunny again (Bournemouth 21.5C Porthmadog 18.5C, Fyvie Castle 3.5C, Cardinham 49.8 mm Pembrey Sands 22.6 mm, Tiree 12.5h Aberdaron 3.3h Valley 1.8h ) [Max 16.0C Min 10.6C Rain 3.5 mm].

    Overcast, dull, damp and breezy on the 12th, but it was fine and by 10 GMT some glimpses of sunshine. Again the housemartins were giving a fine display in the sheltered corner of the field/ Two or three flying over and inspecting the eaves of the house. Pressure 1010 mb was falling with low 977 mb Biscay and Charente Maritime, France. There was a trailing occlusion over the Irish Sea and the sky became increasingly dull in the afternoon thickening enough to bring on drizzle at 15 GMT. The highest temperature was 16.4C at 1127 GMT, that would have been regarded as a good summer temperature here 30/40-years ago. The 24-h maximum 17.7C was at 09 GMT tomorrow when warmer Continental air was being drawn across central Britain. Not good for outside work, sowed purple sprouting broccoli 'Rudolph', kale, chard (Beta vulgaris) and spinach in modules in the greenhouse. Wet in Loftus (41.6 mm) the town lying within the county of North Yorkshire. It lies in a region between Saltburn-by-the-Sea and the North York Moors, it was formerly known as Lofthouse (Tyndrum 23.2C Milford Haven 22.3C, Braemar 2.4C, Loftus 41.6 mm Cardiff 15.0 mm, Loch Glascarnoch 12.2h Aberdaron 8.6h Valley 2.5h) [Max 17.7C Min 10.5C Rain 0.2 mm]. The 13th began sunny and warm with an ENE'ly breeze, scattered clearing clouds, cirrus, altocumulus and cumulus, as an area or rain pushed northwards in N England and Newcastle where over the North Sea a group of sferics had earlier been recorded. With pressure on 1008 mb there was complex slow-moving low-pressure over Biscay and the Charente Maritime where the weather was poor. Warm air from the S was pushing against colder air in the N, a recipe for thunderstorms. A MetO Yellow warning had been issued for N Wales. We had a slight shower at 1450 GMT, just a few drops, and no thunder was heard. Storms did develop in the evening on a line from London to Liverpool (Porthmadog 25.5C, Edinburgh Botanic Gardens 12.4C Tredegar 18.6C, Exeter 7.7C Whitechurch 7.9C, Chillingham Barns 14.0 mm Scolton 8.2 mm, Wattisham 13.6h Aberdaron 9.4h) [Max 20.4C Min 12.9C Rain trace]. Sferics at 1443z on 14 June 2020. Courtesy of blitzortung.org/. A warm start on the 14th with 20.4C recorded at 0900 GMT, the second daily maximum morning. Pressure 1013 mb was rising with a high 1010 mb over the Celtic Sea. Very fine, very clear visibility, but that was to change as with a Yellow warning still in force thunderstorms developed on a line over the Carneddau and Anglesey at 1308 GMT lasting for an hour. Rain fell briefly at a rate up to 75 mm/h at 1325 GMT with 9 mm falling in the hour and event total 14.4 mm. Had started planting out tomato plants on the vegetable plot, retired to shed, resumed later when the storm had passed, the soil previously dry then very wet (Santon Downham 25.5C Hawarden 22.8C, Okehampton 6.9C, Shawbury 31.0 mm Llansadwrn 14.4 mm, Stornoway 15.8h St Athan 9.3h) [Max 20.4C Min 14.2C Rain 14.4 mm]. . Another mild night and very fine at first on the 15th after yesterday's rain, foggy around the coast with moderate visibility here. Cooler this morning with 17.9C at 0900 GMT. Convective clouds were developing to the S and SE and there was an area of rain in S Snowdonia with Capel Curig getting 23.6 mm. Sferics were noted in the area of Shrewsbury and Cheshire, thunder was heard here at 1145 GMT rumbles continuing for about an hour. Only slight rain here, heavy in places including Wilmslow where there was heavy thunder and lightning. The evening was again brighter with glimpses of sunshine. Warmest at Astwood Bank a village south of Redditch. The village is noted for its successful cricket team, who have twice played at Lords in the National Village Knock Out Final (Astwood Bank 25.4C Cardiff 22.4C, Okehampton 6.3C, Castlederg 48.2 mm Capel Curig 23.6 mm, Lerwick 14.6h St Athan 10.0h) [Max 20.4 Min 11.9C Rain 0.5 mm].

    The first 15-days of the month have had nearly half of the normal June rainfall 33.0 mm (43%) and [49%] of averages, but not enough to fully restore the water balance. The mean temperature 13.8C a little below normal (-0.5) and [-0.1] of averages .

    Overcast at first on the 16th with a mild 15.8C air temperature at 0900 GMT. here was a low 1014 mb over the SW Approaches and another 1012 mb over the Baltic, we were in a large slack low-pressure area with 1015 mb here. Visibility was moderate in haze and there was just a light NE'ly breeze that felt fairly warm, if not muggy. There had been a light deposition of dust, a greyish colour with tones of light reddish brown. The SKIRON model indicated patchy Saharan dust over the UK and it's likely it was mixed with local and European dusts. Yellow warnings were out for thunderstorms and sferics were already in the vicinity of the Black Mountains of S Wales. There was a little brightness and glimpse of sunshine around 10 GMT. Sferics spread widely across Britain during the day. Thunder was heard at 1418 GMT and again later from the SE in the direction of the Carneddau Mountains. Fog developed late in the afternoon then cleared during the evening. Storms continued in the Midlands and N England late into the evening dying out before midnight (Heathrow 24.9C Usk 23.4C, Whitechurch 7.0C, Market Bosworth 49.6 mm Llysdinam 45.0 mm, Lerwick 13.1h St Athan 6.5h) [Max 20.5C Min 11.6C Rain 2.5 mm]. Fog returned just after midnight on the 17th and there was a spell of light to moderate rain from 01-03 GMT, it was still foggy at 0600 GMT. At 0900 GMT visibility was poor in mist, but the cloud was thinning a little and was brighter. The temperature was 15.1C (dewpoint 14.3) RH 95%. There was a shower of rain at 0920 GMT. Thunderstorms developed again in SW England, S Wales and Thannet. There was flooding of streets and property in the Rhondda Valley where the villages of Pentre and Maerdy were flooded some for the third time this year. Storms Ciara and Dennis left Wales with an estimated £180m clean-up bill and more than 1000 properties affected in Rhondda Cynon Taff (Source: BBC 19.6.20) an area also badly hit by the COVID-19 pandemic. Sporadic thundery outbreaks occurred again over central England and Cumbria. Showery moderate to heavy rain in the afternoon when thunder was heard, further light showers around 2200 GMT. Localised storms along the N Wales coast (near Rhyl) in the evening (Writtle 24.8C Bala 23.2C, Lerwick 7.3C, Sutton Bonington 40.6 mm Libanus 19.8 mm, Morecambe 9.8h Hawarden 5.2h) [Max 19.4C Min 12.6C Rain 3.4 mm].

    Fog returned after midnight on the 18th and by morning visibility had improved, but was still poor with mist and slight rain at 0900 GMT. Pressure was on 1011 mb with low 1008 mb over the North Sea just off East Anglia where they were getting some welcome rainfall. An area of moderate to heavy rain was spreading from the ESE westward. MetO yellow warnings were in place for thunderstorms in southern Britain; Anglesey, Pembrokeshire and Cornwall were excluded from heavy rain warnings. We would be in the rain shadow of the Snowdonia Mountains as it was coming unusually from the east and not the prevailing southwest on this occasion. It was a dull day, slight rain and drizzle in the morning and a wet afternoon, heaviest at 1507 GMT when falling at 4.2 mm/h though the total was moderate. Not fit to do any outside jobs today (Achnagart 24.5C Porthmadog 17.9C, Aboyne 4.9C, St Athan 50.0 mm, Altnaharra 13.4h Aberdaron 0.5h) [Max 15.8C Min 13.7C Rain 9.6 mm]. Another poor day for gardening on the 19th, but not the garden that has needed the rain with the soil still on the dry side. At 0900 GMT poor misty visibility with heavy drizzle. With pressure steady on 1008 mb we had a low-pressure centre over the Irish Sea, pressure was high 1021 mb France. Similar miserable misty wet weather in the afternoon, very wet in Porthmadog (25.0 mm), but it did start to clear too late in the evening when a few glimpses of sunshine were seen (Altnaharra 22.2C Hawarden 18.4C, Altnaharra 7.6C, Salsburgh 26.6 mm Porthmadog 25.0 mm, Manston 9.4h St Athan 3.5h) [Max 15.3 Min 12.1C Rain 5.0 mm]. Tweet about outbreak of COVID-19 in Llangefni ...The 20th began mostly cloudy and continued variable trying to clear at 0900 GMT when 15.3C, it was sunny along the north and west coasts and visibility here was good. There was a band of cloud lying over North Wales to Sussex, elsewhere sunny. Pressure was steady on 1017 mb with Atlantic-low 985 mb S Iceland and to the SW of Ireland. With high 1023 mb over central France there were strengthening winds in the west as isobars tightened. It was breezy; the cloud broke up in the afternoon and allowed sunny spells though continuing rather breezy (Heathrow 23.0C Hawarden 22.7C, Katesbridge 5.2C, Kinlochewe 21.2 mm Trawsgoed 4.2 mm, Shoeburyness 12.1h Aberdaron 10.6h Valley 10.1h) [Max 19.8C Min 11.3C Rain 3.2 mm]. A blustery day on the 21st with a strong SW'ly wind. On a rising tide a few kitesurfing boards were out on the water at Rhosneigr, not seen for a while due to #Lockdown. Pressure 1010 mb was rising with low 976 mb S of Iceland and W of Scotland. The sky was again mostly cloudy with a triple point near Morecambe. Fine with some weak sunshine at times in the morning, sunny spells in the afternoon with towering cumuli seen over the Snowdonia Mountains. A threatening cumulus cloud passed over here and produced a few spots of rain at 1335 GMT. Staked and tied up recently potted up chrysanthemum plants as it looked like a windy spell coming up. A developing frontal wave low over the Atlantic at noon 1007 mb began sneakily tracking towards SW Ireland reaching there 1003 mb at midnight (Heathrow 23.9C Hawarden 19.1C, Aboyne 7.4C, Whitechurch 23.4 mm, Aberdaron 11.2h) [Max 17.1C Min 12.1C Rain trace]

    A very windy day on the 22nd, at 0900 GMT with pressure steady on 1019 mb there was a S'ly force 6 to 7, force 8 had been forecast for the Irish Sea, unseasonable for this time in June, but not unusual. Overcast, conditions were dry here, but rain was on the radar off South Stack and the Llyn. The sneaky low was 1003 mb off Malin Head with a triple point SE Ireland at 06 GMT, pressure was high 1028 mb relatively closeby over Brittany, as a result isobars were tight to the W and NW including the Celtic Sea. The day continued dull and breezy with strong gusts. There was light rain from 16 to 20 GMT (Heathrow 23.9C Cardiff 22.8C, Aboyne 2.3C, Eskdalemuir 17.2 mm Whitechurch 14.6 mm, Shoeburyness 15.5h St Athan 9.4h) [Max 16.4C Min 10.9C Rain 1.0 mm]. Meteosat MSG image (c) EUMETSAT at 12 GMT on 23 June 2020, courtesy of Ferdinand Valk.The sky was overcast again on the 23rd, visibility was poor and there was slight drizzle although nothing was indicated on the rainfall radar. Pressure 1021 mb was rising with lows 1010 mb Norwegian Sea and 984 mb S Iceland, there was a cold front lying across the N Channel to the Azores. Pressure was high 1026 mb over the Netherlands, northern Britain was wet while with a plume of warmer air encroaching southern Britain it was sunny and warm in the SE resulting in an early temperature range NW 12C to 24C SE. The afternoon eventually turned sunny and warm here 21.3C at 1500 GMT as the cloud moved northwards clearing Anglesey (Heathrow 28.6C Cardiff 25.3C Fair Isle 13.3C, Kinbrace 7.7C, Eskdalemuir 22.8 mm Whitechurch 5.2 mm, Wattisham 15.4h St Athan 14.9h Valley 3.4h) [Max 21.3C Min 14.2C Rain 0.1 mm].

    Herbaceous border in our garden at Gadlys.

    The 24th began very fine and sunny with 4 oktas cover of cirrus clouds. Pressure was on 1021 mb in a ridge of high-pressure from high 1028 mb over S Norway to Wales. There was lingering frontal cloud to the NW that was not to bother us. The warmer air had reached us and winds were light. The local farmer took advantage of the light wind and sprayed the adjacent barley field which is growing up well. Sunny with the temperature reaching a warm 23.8C here in the afternoon. Hot in parts of southern Britain (Heathrow 32.6C Cardiff 30.0C Harris Quidnish 14.5C, Redesdale 8.1C Mona 8.3C, Port Ellen, Islay 15.2 mm, Morecambe 15.4h Aberdaron 15.0h) [Max 26.4C Min 11.7C Rain nil]. Tweet about outbreak the hot weather ...Well you don't seem to be able to have hot weather in these parts without thunderstorms developing. On the morning of the 25th there were sferics recorded over the N channel at 07 GMT tracking north-east. Convergent breezes developed with cloud development at first over Morecambe Bay, the breeze settling into a SW'ly here. The temperature at 0900 GMT was a remarkable 26.4C (dewpoint 19.3C) RH 65% the maximum of the past 24-h. And it kept on rising reaching a record hot 31.3C at 1307 GMT. Towering cumulus clouds were seen and cumulonimbus developed and thunder was heard from 1706 GMT onwards. Sferics at 2128z on 25 June 2020. Courtesy of blitzortung.org/. Frequent TL observed with heavy rain showers with a rate of 46 mm/h at 1950 GMT and 5.0 mm of rain falling in an hour. Heavier rates up to 64 mm/h at 2240 GMT with brilliant lightning was seen from Llanfairfechan and Holyhead (Heathrow 33.4C Cardiff & Llansadwrn 31.3 Stornoway 14.7C, Loch Glascarnoch 6.2C, Port Ellen, Islay 20.6 mm Llansadwrn 8.8 mm Mona 0.6 mm, Wattisham 15.9h Valley 14.0h) [Max 31.3C Min 15.3C Rain 9.0 mm]. Thunder and lightning at 02 GMT on the 26th with heavy shower of rain. By morning there were signs of a break in the covering of cloud and there was a little weak sunshine, even a glimpse of clear sunshine. An overnight air minimum of 16.4C was highest of the month and highest since 2006 17.4C with the 17.6C in 2005 highest on record. Fine and warm with 19.7 at 0900 GMT. Pressure was on 1007 mb with a thundery low 1006 mb over Ireland, a cold front lay over the Celtic Sea and there were shower troughs over the western fringe and Thannet in the SE. Visibility was good with smoke haze moderate level 5. Tweet about 10 degrees less than yesterday ...A brief sunny spell in the evening then heavy rain up to 30 mm/h at 2330 GMT and thunder and lightning here at 2319 GMT and 2345 GMT (Kew Gardens 31.2C Hawarden 27.3C Aberdaron 14.9C, Braemar 7.4C, Castlederg 40.6 mm Whitechurch 22.4 mm, Reading University 14.1h Hawarden 5.9h Valley 0.5h) [Max 20.8C Min 16.4C Rain 9.8 mm]. There was more thunder and lightning locally after midnight on the 27th with heavy rain at 0220 GMT. The sky was overcast in the morning and it was spotting with rain at 0900 GMT. Cooler with 14.5C 93% RH, visibility was good the air pollution at a lower level 2 this morning. Pressure 998 mb was falling with complex low 994 mb off Malin Head, 993 mb at noon. Dull and breezy, blustery at times, a glimpse of sunshine then a shower of rain at 0930 GMT. Frequent showers throughout the day, unfit for work in the garden, there were 12 wet hours in the 24-h period (Kinloss 26.5C Hawarden 20.4C Capel Curig 14.6C, Redesdale 8.9C, Sennybridge 24.0 mm, Stornoway 8.5h Hawarden 2.6C Valley 0.9h) [Max 16.7C Min 13.0C Rain 5.2 mm].

    The 28th dawned mostly cloudy and very windy. At 0900 GMT pressure 1003 mb was rising with slow-moving, but filling low 987 mb near N Scotland. Visibility was moderate with rain in sight. The weather was sunny in the SE, but again in the NW there were light to heavy showers. A mostly cloudy day, with rain and or drizzle almost throughout, heaviest at 1509 GMT 3.8 mm/h, and strong to gale-force SW'ly wind. Rain duration (wet hours) were 17 in the 24-h period. Coolest day with 13.6C since the 3rd 12.1C (Heathrow 22.0C Cardiff 17.6C Blencathra 10.8C, Okehampton 8.9C, Kielder Castle 48.0 mm Lake Vyrnwy 28.4 mm, Manston 11.9h Aberporth 6.1h Valley 0.8h) [Max 13.6C Min 11.2C Rain 14.2 mm]. The 29th was a very dull and sunless day, low hill fog on the Snowdonia Mountains where very wet. Cooler than of late and windy too the WSW'ly force 5 moderating through the day. A 0900 GMT there was just 65 W m -2 of solar radiation and this improved to only 269 W m -2 at 14 GMT some 25% of what could be expected this time of year. Pressure 1005 mb was rising with low 988 mb little changed still N of Scotland. An occlusion was sitting over N Wales and the cloud base was about 500 ft with drizzle at times here. Not much precipitation in daylight hours, light rain after midnight of duration 5 hours. Wet at Capel Curig (Heathrow 21.7C Cardiff 17.0C Lake Vyrnwy 10.7C, Dalwhinnie 8.4C, Capel Curig 34.6 mm, Manston 8.7h St Athan 1.6h Valley 0.0h) [Max 13.6C Min 10.5C Rain 1.8 mm]. The 30th and the last day of a strange June, the record setting weather events and COVID-19 pandemic issues, not that we have seen the end of either. Well, it had stopped raining at 0900 GMT after all night drizzle and rain. The sun was starting to break through the mostly cloudy sky. Cool, bright and wet, but not the end of 4-days of unseasonable weather. Pressure was not seeing much change with low 992 mb on the southern tip of Norway it was 1005 mb here. The day kept mostly cloudy with showery rain at times duration 9 hours. Pressure had fallen to 1002 mb at 1800 GMT when we had a short spell of heavy rain on a frontal system and quick fall in temperature of 3C from 16C (Weybourne 21.9C Hawarden 19.5C, Lake Vyrnwy 9.5C, Ballypatrick Forest 9.8 mm Bala 3.4 mm, Tiree 10.5h Bala 2.1h Valley 0.8h) [Max 15.9C Min 11.1C Rain 4.6 mm] .

    The month ended with a rainfall total of 102.4 mm (144%) & [151%] of averages largest since 2017, one of the 19th wettest in Llansadwrn since 1928. The mean temperature was 14.7C (+0.5) & [+0.8] of averages highest since 2018 and the 12th warmest June in my records since 1979. The 31.3C on the 25th was the highest recorded in June at this station since records began in 1979 Despite 6 sunny days (>10h) it was a dull month overall, the 137.5 h sunshine at RAF Valley the 9th lowest on the Anglesey record back to 1931. There was an unusually high number of thunder events, but no hail .

     

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    July 2020

    July 1 - began in a dull and wet manner . At 0900 GMT with the sky overcast it was misty with drizzle imparting moderate visibility. The temperature was 14.0C with 95% RH, rising to 16.8C at noon. Pressure was 1003 mb in a trough of low-pressure N Wales and N England within a large area low 976 mb centred N Finland. It rained on and off most of the day (Weybourne 21.9C Hawarden 19.5C, Exeter 9.5C, Ballypatrick Forest 9.8 mm Bala 3.4 mm, Tiree 10.5h Bala 2.1h Valley 0.0h) [Max 16.8C Min 11.7C Rain 12.8 mm]. Red squirrel 'Peanuts' prefers shelled peanuts for birds to whole provided in the boxes.The 2nd dawned overcast and very dull solar radiation (SR) 211 W m -2 with drizzle there being a slow=moving occlusion over the Irish Sea and N Wales, but by 0900 GMT the sky looked a little brighter. Pressure 1010 mb was rising quickly the low 996 mb S Sweden with highs 1026 mb Azores and 1015 mb Greenland. Elsewhere showers some heavy with cumulonimbus reported in the south-east. The weather cleared up really slowly, sunny intervals SR 974 W m -2 at 1408 GMT then by the end of the afternoon the sky was clear. Red squirrels are seen frequently at the weather station and can be identified by their colour markings and behaviour, we provide nuts in boxes that most eat. This one we call peanuts prefers shelled peanuts provided for birds (Heathrow 22.5C Usk 20.8C, Altnaharra 0.3C Tredegar 10.3C, Hull 29.6 mm Valley 9.8 mm, Tiree 9.1h Aberporth 6.7h Valley 6.5h) [Max 17.2 Min 12.1C Rain 8.7 mm]. Heavy rainfall in Wales on the 3 July 2020.Heavy rain, blustery wind and very poor visibility on the morning of the 3rd, the stratiform cloud looking grey to ground level towards the Snowdonia Mountains. Today it did not clear up and rained most of the time, thick cloud on a warm front, very dull at 0900 GMT SR 104 W m -2 rising to only 178 W m -2 at 1002 GMT. Did not go out again after the observations were completed, but there were some kite surf-boarders on the water at Rhosneigr. A sunless and very wet day [35.5 mm] falling here, largest of the month and [97.0 mm] falling in Capel Curig, the largest in Europe on this day. The wind moderated and the temperature rose through the day with the maximum 14.4C occurring at 2200 GMT (Heathrow 22.5C Cardiff 19.1C; Braemar 6.3C Lake Vyrnwy 9.1C, Capel Curig 83.6 mm, Manston 10.4h St Athan 0.4h) [Max 14.4C Min 11.2C Rain 35.5 mm]. There was thick fog after midnight on the 4th and little change by morning, with moderate fog at 0900 GMT. Again very dull with a SR high of 257 W m at 0923 GMT. It did not get better, but the rain was not as heavy as yesterday, but it was wet still the same and sunless. Llyn Tegid at Bala had overflowed in parts, it was windy in southern Britain there was a gale warning for the Irish Sea, but less so in the north. Wind turbines were generating 27% of the UK electricity demand. Two cold fronts passed over later, at 18 GMT and 02 GMT, the SW'ly gusting to 39 mph at times (Charsfield 21.7C Hawarden 21.1C, Braemar 3.0C, Stonyhurst 29.8 mm Capel Curig 25.6 mm, Bala 4.2h Valley 0.0h) [Max 15.6 Min 12.9C Rain 2.7 mm]. A fine and breezy morning on the 5th with a few cumulus clouds and good, but hazy visibility. The gardeners' gale overnight had cause minimal damage as we have fragile plants well tied in just in case, and the herbaceous border is planted tight so that the plants support each other. It is looking great. Pressure 1008 mb was rising with the jetstream over Britain there was a low 983 mb over the North Sea. A cold front lay over SE England and the SW Approaches with high pressure as usual over the Azores 1031 mb. With Wales lockdown easing there were people back at the reopened carpark at Llyn Tegid, Bala, visitor centre. Mostly sunny, warm in the SE (Manston 24.4C Hawarden 17.9C, Loch Glascarnoch 8.0C, Eskdalemuir 32.8 mm Lake Vyrnwy 10.6 mm, Shoeburyness 12.3h Aberporth 11.7h Valley 7.8h) [Max 16.1C Min 12.0C Rain 0.3 mm].

    Early light showers of rain on the 6th with a mostly cloudy sky in the morning. Pressure 1020 mb was rising quickly and the jetstream still over southern Britain, but here on the edge we had some sunshine in the afternoon with the highest solar radiation 1055 W m -2 as a transient ridge from Azores high 1033 mb developed. I have waited a while to get a photograph of one of the red-tailed bumblebees Bombus lapidarius we ave in the garden, today I succeeded Sunniest in the north (Pershore 22.3C Cardiff 30.3C, Braemar 7.5C, Myerscough 11.8 mm Capel Curig 1.4 mm, Glasgow 11.3h Aberporth 8.0h Valley 5.7h) [Max 18,1C Min 10.3C Rain 1.4 mm]. Red-tailed bumblebee on geranium nodosum in our Garden at Gadlys.AWS temperature and solar radiation record for the 7 July 2020.Low cloud on the 7th although visibility was good towards the Snowdonia Mountains. Dull and wet solar radiation at 0900 GMT just W m -2, temperature 11.9C. Pressure 1019 mb was falling, there was a train of lows driven by the jetstream over the Atlantic, responsible for the moist tropical air, one of which was the remains of ex-hurricane Edouard. Not to be confused with same named hurricane strongest of the season in 1996 that developed near Cape Verde, the storm formed near the coast of Africa in the middle of August. It moved westward then curved northward, and persisted for 8 days with winds up to 145 mph until early September when it became extratropical to the south-east of New England. It was a sunless day, very dull highest SR 292 W m -2 at 1050 GMT, with fog developing at 5 pm becoming thick (code 1). Hardly a summer temperature struggling to get to 13.8C in the evening at 2149 GMT with the low 1013 mb passing over North Wales at midnight. The temperature graph looked odd with the highest overnight the reverse of the normal rise associated with solar radiation received during daylight hours (Heathrow 22.6C Cardiff 17.6C, Wick Airport 5.4C Porthmadog 8.4C, Gogerddan 21.6 mm, Prestwick 8.6h St Athan 1.9h Valley nil) [Max 13.8C Min 10.6C Rain 1.4 mm]. Another dull and damp start to the day on the 8th with slight showers of rain under an overcast sky. Pressure was on 1014 mb with low 1012 mb central England that forecaster said was contained remnants of Edouard. The temperature at 0900 GMT 13.6C, a brighter spell about 11 GMT when there was a little weak sunshine as the cloud thinned a little, otherwise much of the same. The temperature rose to 15.8C at 1220 GMT, the afternoon turned wet with light rain and drizzle with a light to moderate spell in the evening (Heathrow 22.6C Cardiff 17.6C, Fair Isle 11.5C Lake Vyrnwy 12.6C, Wick 5.4C Porthmadog 8.4C, Gogerddan 21.6 mm; Prestwick 8.6h St Athan 1.9h Valley 0.6h) [Max 13.6C Min 10.6C Rain 7.7 mm]. Yet another very dull and damp day on the 9th with overcast uniform grey sky. Visibility was moderate with mist and there was a cool feeling NE'ly breeze. Mostly dry, some spots of drizzle at times, sunless here. Maximum temperature 13.8C was lowest of the month (Writtle 20.8C Usk 19.8C, Achnagart 2.9C Mona, Anglesey 12.3C, Emley Moor 33.0 mm Gogerddan 18.8 mm, Boulmer 11.3h Aberdaron 4.8h Valley 0.8h) [Max 13.8 Min 12.1 Rain 0.2 mm].

    A fine bright morning on the 10th for a change, chilly overnight the air minimum 7.8C, lowest of the month and 4.4C on the grass with moderate dew. It was already sunny in Penmon and eastward at Llandudno, and NW Anglesey at Rhosneigr at 0900 GMT. There was a NW breeze and this is always results in cloud over Llansadwrn (7 oktas) the result of close proximity to the Carneddau Mountains. Pressure 1020 mb was rising with Azores high 1027 mb stretching as far as W Ireland. Later with scattered cumulus clouds we had frequent sunny spells in the afternoon (Shoreham 21.2C Cardiff 18.9C. Kinbrace 4.2C, Spadeadam 16.8 mm Whitechurch 1.4 mm, Bude 13.8h Aberdaron 13.4h Valley 10.0h) [Max 17.3C Min 7.8C Rain nil]. A tad more W in the breeze this 11th morning with a WSW'ly, but it did not make a lot of difference to the cloud cover with 7 oktas Visibility was very good and it was a lot warmer than expected 15.2C at 0900 GMT after a minimum of 7.9C and 3.8C on the grass, lowest of the month. Pressure 1028 mb was rising within the high over the Celtic Sea. The NW fringe was mostly cloudy, but it was sunny in the S and E of the country. Clear and sunny at Rhosneigr and with easing of #lockdown cars were already lined up parked alongside the A5 at Tryfan. Some sunshine at times, if you were in the shade it felt chilly. Picked 3 lbs of blackcurrants (Gosport Fleetlands 23.1C Cardiff 21.0C, Benson 3.8C Sennybridge 4.0C, Loch Glascarnoch 4.0 mm Rhyl 0.2 mm, Aberdaron 14.6h Valley 12.4h) [Max 18.3C Min 7.9C Rain nil]. With a SSW'ly breeze cloud cover was 6 oktas on the 12th at 0900 GMT, visibility was excellent and clear. Quite sunny at times and especially in the afternoon and feeling warmer, but still a bit chilly if in the shade. Pressure was steady on 1028 mb UK high. Sowed a row of Oregon sugarpod peas, the third in succession to keep up the supply for the kitchen. Picked broadbeans for dinner. Kept dry through daylight hours (Heathrow 25.2C Usk 22.9C. Sennybridge 1.3C, Harris Quidnish 5.4 mm, Shoeburyness 14.9h St Athan 12.9h Valley 7.2h) [Max 19.3C Min 9.3C Rain 8.6 mm]

    Rain after midnight on the 13th, light to moderate and heavy around 0630 GMT. Recent rain, overcast and very dull under thick cloud W m -2 at 0900 GMT, poor visibility with low fog on the slopes of the Snowdonia Mountains. The strong SW'ly wind was suiting the 10 wet-suited kite surfers out on the water at Rhosneigr, and they didn't mind the rain. Not suitable for gardeners, perhaps with wet suit, but not for me. There was a low 1005 mb between Iceland and Scotland with a cold front over the North Channel, we were in warm sector air. Despite the cloud and intermittent drizzle the amount of rainfall was only 0.2 mm. The day was sunless, but to the SE of here it was mostly sunny and hot in places (Shoeburyness 26.4C Cardiff 20.2C, Fair Isle 13.2C Sennybridge 15.0C, Goudhurst 6.5C, Scolton 17.0 mm, Shoeburyness 10.8h Lake Vyrnwy 0.5h) [Max 16.1C Min 13.6C Rain 0.2]. Dull again on the 14th beginning fine with good visibility and calm. The grass was very wet and a fairy ring was evident showing up in the moist conditions. The webcam view from Moelfre across Red Wharf Bay towards the mountains was a study in grey. A poor day for July, a shower in the afternoon and sunless here. Light rain from 1700 GMT with moderate fog developing in the evening (Heathrow 23.1C Cardiff 20.4C, Topcliffe 7.4C, Altnahinch 12.4 mm Mona 3.2 mm, Leuchars 7.9h St Athan 1.7h Valley 0.3h) [Max 15.3C Min 11.6C Rain 5.6 mm]. Much the same on the 15th showery rain in the small hours, grey clouds to ground level looking towards the mountains with mist and drizzle. Very wet everywhere, trees dripping with moisture. Light level low again 120 W at 0900 GMT the day sunless. Inside work today (Leuchars 21.0C Milford Haven 19.6C, Giants Causeway 13.2C, Houghton Hall 7.1C, Altnahinch 10.0 mm Trawsgoed 6.8 mm, Manston 6.5h Aberporth 0.9h Valley nil) [Max 14.9C Min 11.9C Rain 0.9 mm].

    The first 15-days of the month have been wet and cool. Rainfall of 104 mm was more than the usual for the whole month with (119%) & [149%] of averages. The mean temperature well below normal 13.6C (-2.2) & [-2.1] of averages and the mean maximum 16.2C remarkably (-3.2) & [-3.3] of averages .

    Continuing the unseasonable dull and wet weather the 16th began, well yes, overcast dull and misty with slight rain and drizzle. Cloud was just on the tops of the Snowdonia Mountains. Toadstools and moss in the weather station wood at Gadlys.Pressure 1022 mb was rising with Azores high 1030 mb extending a ridge towards southern Britain. Low 981 mb Iceland had a warm front over western North Sea so we were in the uncomfortable humid warm sector air the trees imitating a rain forest continuously dripping. Its why mosses grow well on the old stone walls and fallen tree trunks hereabouts. Fungi are very noticeable this year in the wood and elsewhere () [Max 19.8C Min 12.8C Rain 0.1 mm]. The 17th the same overcast sky and recent slight showers with more in sight at 0900 GMT. With slow-moving low 986 mb over E Iceland there was a cold front over the North Channel. Breezy the SSW'ly force 5 with the sun appearing weakly through thinning clouds at times. Drier later with bright spells, but not clearing up properly. Rain after midnight (Heathrow 28.5C Hawarden 24.0C Capel Curig 16.0C, Okehampton 9.0C, Killylane 14.6 mm Capel Curig 0.4 mm, Bournemouth 12.1h Hawarden 6.1h Valley 0.6h) [Max 19.3C Min 13.8C Rain 13.6 mm]. It was dull and very wet on the 18th with moderate rain in the morning. The rain was mainly in N England, Wales and S Ireland and this was helping to make this July one of the wettest in Llansadwrn on record. At 1400 GMT total rainfall had reached 123.7 mm [177%] of average. Low 990 mb was E Iceland and there was a cold front lying across the Irish Sea over the Isle of Man. This cleared southwards during the evening (Charlwood 26.4C Cardiff 19.7C, Aboyne 3.8C, Spadeadam 20.6 mm Gogerddan 18.8 mm, East Malling 12.9h Valley 2.8h) [Max 15.0C Min 14.0C Rain 7.0 mm). There was clear sky overnight and as a result cooler the air minimum 9.8C and falling to 5.7C on the grass with dew formed. On the morning of the 19th it was fine and sunny, with some development of convective cumuli over the mountaintops. There was a light NNE'ly breeze, boats were out on the water between Puffin and Conwy. Enjoying a splash at Aberffraw Bay.Large crowds were at Llyn Tegid, Bala, and in Snowdonia Penypass and A5 at Tryfan and Ogwen were busy people taking advantage of relaxing of COVID-19 restrictions and the better weather (Pershore 22.3C Usk 21.7C, Aberporth 15.5C, Katesbridge 1.4C, Holbeach 19.0 mm St Athan 10.2 mm, Morecambe 14.6h Aberdaron 14.0h Valley 13.1h) [Max 17.0C Min 9.8C Rain nil]. Great, another fine day on the 20th with pressure 1025 mb rising courtesy of Azores high 1028 mb stretching that little bit further to Ireland and Wales. Variable breezes an scattered cirrus and cumulus clouds, cool clean air drawn from the region of Iceland. Sunny spells becoming sunny by afternoon. Checked over the car in preparation for a site visit if the weather holds (Gosport 24.4C Usk 22.0C, Aberporth 15.8C, Sennybridge 2.3C, Achnagart 11.2 mm, Bude 14.9h Aberdaron 14.5h Valley 12.2h) [Max 18.5C Min 8.8C Grass 4.0C Rain nil].

    View across Anglesey NE of Aberffraw #unlocked on 21 July 2020.

    The 21st dawned fine, but disappointingly dull with the sky overcast with moderately high cloud just touching the tops of the Snowdonia Mountains; solar radiation was 153 W m -2 at 0900 GMT. Marsh helleborine orchids at Aberffraw dunes.Another cool night with the temperature on the grass dipping to 4.4C with moderate dew formation. Round-leaved wintergreen at Aberffraw dunes.Cloud persisted in Llansadwrn as usual, but it was pleasantly sunny at Aberffraw on the beach and brighter at Penmon Point and Llanfairfechan. Went on a site visit, the first since mid-February lockdown, to Tywyn Aberffraw too late to see many of the spring flowers and orchids, there was a late flush of marsh helleborines (photo left and below)on the big slack so that made the day and the trip out worthwhile. Also seen were round leaved wintergreen (photo right) and masses of wild thyme along with evidence that the dunes had been eco-grazed overwinter by the Murray Grey cattle (below right) (Gosport 24.7C Cardiff 22.1C, Sennybridge 2.2C, Wick 8.0 mm, St Athan 14.6h Valley 7.5h) [Max 18.8C Min 9.4C Rain nil].

    ¤

    The 22nd began bright and showery with signs of the sky clearing, but this was not to be. There was a blustery moderately strong SW'ly air from northern Arctic regions. Pressure 1022 mb was falling slowly with a minor low 1013 mb off the Hebrides. Marsh helleborine orchids at Aberffraw dunes.Azores high 1027 mb had an arm to S Britain, the Channel, NW France and Belgium 1027 mb. Southern Britain was mostly sunny while the W and NW had showery weather, N Scotland was better was Drizzle at times then rain in the afternoon here although Penmon and mainland coastal areas sunny, turning moderate to heavy in the evening (Heathrow 26.3C Cardiff 22.3C, Inverbrevie 12.1C Aberdaron 15.3C, Aboyne 3.9C Sennybridge 5.6C, Dunstaffnage 28.2 mm, Lerwick 15.0h St Athan 12.1h Valley 0.7h) [Max 18.2C Min 11.9C Rain 10.2 mm]. There was a lot of wild thyme flowering at Aberffraw dunes.A very poor day for outside activities on the 23rd beginning overcast with grey mist and rain to low level. Pressure 1014 mb was falling and the day continued in similar fashion. Best about it, well the rain would go someway towards restoring the water balance of the soil (Northolt 26.6C Whitechurch 21.1C, Ballypatrick Forest 14.0C Aberdaron 15.6C, Frittenden 8.6C, Dundrennan 40.4 mm Porthmadog 10.0 mm, Manston 9.4h Aberporth 3.0h Valley nil) [Max 16.2C Min 13.0C Rain 6.8 mm]. A better day than expected on the 24th after fog in the small hours had cleared beginning fine and bright with glimpses of sunshine. Visibility was very good and there was little wind so that the 15.8C felt pleasanter. Very wet underfoot so any work on soil in the garden was not a good idea until it dries. Rainfall this month so far had reached 152.9 mm. Further light to moderate rain from 1830 GMT with a heavy burst just before midnight (Kew Gardens 25.9C Hawarden 23.1C Gadlys Gardens 19.4C, Braemar 4.0C, Port Ellen 13.6 mm Porthmadog 7.4 mm, Lerwick 10.3h Valley 4.7h) [Max 19.4C Min 12.5C Rain 10.5 mm].

    Early morning fog on the 25th was clearing away at 0900 GMT visibility then moderate. Very dull solar radiation just 132 W m -2 reaching 234 W m -2 just after noon, the temperature 14.5C with 96% RH felt muggy. Thunderstorms developed later in Devon and South Wales spreading to central England, the Welsh Borders and NE Scotland, giving us a miss (Coningsby 25.6C Hawarden 21.4C, Baltasound 10.6C, Craibstone 35.6 mm Capel Curig 24.6 mm, Leuchars 5.6h Hawarden 2.2h Valley 1.0h) [Max 15.9 Min 14.4C Rain 0.3 mm]. A fine, but breezy and again dull morning on the 26th with pressure 1008 mb rising things improved a little. There was a complex low NW Scotland this having associated occluded frontal cloud Western Isles, Ireland and here. It was brighter by 10 GMT with glimpses of sunshine continuing mostly cloudy, but dry through the day. Slight rain came along during the evening (Teddington 24.2C Hawarden 20.7C, Katesbridge 7.8C, Harris Quidnish 10.6 mm Tredegar 5.0 mm, Tiree 9.6h Aberdaron 5.5h Valley 2.7h) [Max 18.4C Min 11.7C Rain 17.8 mm]. Moderate to heavy rain after midnight on the 27th and a dull grey to ground morning with very poor visibility. It was sad to see the garden being battered by the S'ly force 6/7 'gardeners' gale' with rain making the plants heavy, but pleased to see many flowering plants on the herbaceous border, that the head gardener lovingly spends many hours tending, standing up to it well. I keep the tomatoes well tied in to stakes on the vegetable plot, guy ropes on the row of runner beans and potted chrysanthemums tied in although there was some damage to these. A few Bardsey and Gaerwen pigs' snout apples had been blown off, I picked them up but they are still too small to do much with. Pressure 996 mb was falling rapidly with low 994 mb Ireland with frontal triple-point near Bardsey Island at 06 GMT tracking to the Isle of Man 995 mb by 0900 GMT. Early thunderstorms developed in Somerset and S Wales tracked towards the Home Counties. Cloudy all day until the frontal system with well defined edge cleared slowly at noon to give a sunny fresh afternoon. Rainfall total up to 171.0 mm chasing the July record 182.1 mm recorded here in 2010 (Pershore 22.9C Hawarden 20.8C, Fyvie Castle 4.1C, Shap 35.8 mm Capel Curig 28.8 mm, Lerwick 6.2h Valley 5.1h) [Max 18.4C Min 11.7C Rain 4.2 mm]. A bright start on the 28th after a cool night 6.0C on the grass, convective cumuli were forming at 0900 GMT. Pressure 1014 mb was rising rapidly the low now 986 mb off Aberdeen gusting 48 mph at Wick. Pressure was high 1022 mb SE from Greenland and with a NW'ly breeze it was fresh with polar maritime air introduced having closed and open cell marine convection over the Atlantic to the north-west. There was a slight shower at 0915 GMT otherwise dry. Some sunshine at times, the Llansadwrn convergent cloud formed at noon persisting into the afternoon, occasionally sunny (Shoreham 23.0C Cardiff 19.2C, Killylane 7.9C Libanus 9.3C, Fair Isle 24.0 mm Rhyl 1.0 mm, Aberporth 11.3h Valley 9.6h) [Max 17.3C Min 10.7C Rain trace].

    A fine bright morning on the 29th with some thinning moderately high altostratus. Very good clear visibility and feeling warmer Pressure was steady on 1020 mb with lows 995 mb S Norway and Iceland the latter having frontal cloud mass over SW Ireland where raining. High 1022 mb near Brittany had a ridge to Cardigan Bay and Anglesey. Frontal cloud and rain over central England, fine and sunny south coast, East Anglia and NE England and Scotland. Warmer air from the south was being introduced with rising temperatures here, this when meeting the cooler northern air could lead to instability later. (Heathrow 24.5C Usk 21.3C, Exeter 4.5C Usk 6.0C, Resallach 10.0 mm, East Malling 13.5h St Athan 7.7h Valley 3.7h) [Max 16.9C Min 10.8C Rain 2.2 mm]. Showery rain came along from midnight on the 30th amounting to 2.2 mm by morning. A fine morning with the sky clearing and very good visibility. Pressure steady on 1016 mb with low 990 mb S Iceland and a warm front over the N Irish Sea. Feeling warmer 16.4C at 0900 GMT in the plume of warm air from the south rising to a pleasant 22.8C at 3.30 pm in the afternoon (Heathrow 29.7C Hawarden 26.9C, Tulloch Bridge 2.0C, Dundrennan 17.4 mm Valley 4.2 mm, Wattisham 14.9h St Athan 13.6h) [Max 25.7C Min 13.2C Rain nil]. The overnight air minimum of 14.8C was highest of the month. It kept very fine, sunny and warm on the last day of July the 31st with a clear sky at 0900 GMT and remarkably for here a hot temperature of 25.7C 55% RH that by convention was credited to the 30th. The temperature rose to a maximum of 27.4C at 1141 GMT, highest of the month. Cloud encroached just after noon to give a mostly cloudy afternoon taking the edge off the temperature 21C at 1500 GMT. there was a shower of rian before midnight (Heathrow 37.8C Kew Gardens 37.3C third highest temp on record Hawarden 30.7C, Shobdon 8.3C Bala 10.1C, Ryhill (W Yorks) 10.8 mm, Weybourne 13.5h Hawarden 8.7h Valley 7.6h) [Max 27.4C Min 14.8C Rain 2.2 mm].

    The month ended with a rainfall total of 179.6 mm (205%0 & [257%] of averages wettest since 2010 and 2nd wettest July on record in Llansadwrn since 1928; the mean temperature 14.6C (-1.3) & [-1.1] of averages was coolest since 2012 rank 7th in station records since 1979; there was a notable absence of thunder and hail; dullest since 2012 at Valley rank 17th on Anglesey record since 1931.


    August 2020

    August 1 - the last month of meteorological began on a pretty poor note with the sky overcast in contrast to the last days of July. It was raining and visibility was very poor as much of the NW of Britain. The SE was fine with sunny spells or clear sunshine. Pressure 1015 mb was rising and there was a little improvement by afternoon that had a sunny spell towards the end. The maximum today? Well 10C lower than yesterday (Heathrow 27.7C Usk 21.9C, Tulloch Bridge 14.5C Sennybridge 16.3C, Derrylin Cornahoule 8.9C, Altnahinch 14.8 mm Valley 6.8 mm, Waddington 10.9h St Athan 9.8h Valley 3.3h) [Max 17.7C Min 13.4C Rain 2.2 mm]. A fine and breezy morning on the mostly cloudy morning of the 2nd an back to normal with a cooler airflow and a recent shower of rain. Pressure 1017 mb was still rising slowly with low 990 mb Iceland and 997 mb Nova Scotia resulting in the W'ly flow. Pressure was high 1027 mb over the Azores. Various shower troughs were charted in the west and Ireland and we had a few through the day, otherwise sometimes bright (Heathrow 25.4C Usk 21.7C, South Newington 6.5C, Killylane 18.2 mm Mona 3.2 mm, Shoeburyness 10.2h Aberporth 10.1h Valley 4.9h) [Max 18.2C Min 12.1C Rain 1.2 mm]. A fresher feel on the 3rd after a cool night 7.3C on the grass, with very good visibility. Cloud was increasing and here were showers in the vicinity. Pressure was on 1018 mb with low 999 mb SE Iceland and low 989 mb S of Greenland over the Atlantic to the west. The temperature was 14.6C and there was a light WNW'ly breeze. A mostly cloudy, but dry day with infrequent sunny spells. Lifted my row of Angus potatoes, bought in for the kitchen that had sprouted planted during lockdown, quite pleased with the result there is nothing like boiled new potatoes to have with roast dinner (Gosport 24.2C Usk 20.4C, Eskdalemuir 3.1C Sennybridge 6.1C, Rhyl 11.8 mm, Yeovilton 13.0h St Athan 11.0h Valley 8.0h) [Max 17.8C Min 10.2C Grass 7.3C rain 1.2 mm]. A rather poor morning on the 4th with overcast sky looking grey to ground level in mist and slight rain. Low 990 mb was S of Iceland and there was a warm front over Ireland where at Bellmullet the wind was gusting 45 mph. A sunless day the blustery wind strengthening to 35 mph and turning very wet late afternoon and evening, The AWS raingauge malfunctioned due to the petiole of a leaf entering the funnel outlet and preventing tipping, not had that one before. On inspection next day there was also a slug found inside the housing, had that before when slime ruined the sensor that had to be replaced, but no problem on this occasion. The official copper gauge is always manually read at 0900 GMT which caught 23.5 mm (Heathrow 24.9C Usk 21.0C, Aboyne 3.4C Usk 5.3C, Tyndrum 71.0 mm Sennybridge 4.8 mm, Manston 13.4h Hawarden 1,4h Valley nil) [Capel Curig 53.8 mm Mona 10.4 mm Valley 6.2 mm Hawarden 1.0 mm] [Max 16.7C Min 11.1C Grass 7.5C Rain 23.5 mm]. The 5th continued the autumnal theme with masses of browned leaves dropping from the beech trees, at times looking like snow, almost covering the ground in laces aided by a blustery force 5 SW'ly. Visibility was poor with mist and slight rain and drizzle. There was minor damage all over the garden with some potted plants blown over and broken chrysanthemum stems despite the tying up done. Low 978 mb Iceland had a triple-point frontal wave SW Ireland and a warm front straddled the Irish Sea. So warm, 16.4C at 0900 GMT rising to 18.7C just after noon, and moist although the total precipitation collected over the 24h was only 0.6 mm (Santon Downham 28.4C Cardiff 22.7C, Frittenden 11.6C Tredegar 14.3C, Capel Curig 55.4 mm, Shoeburyness 12.5h St Athan 2.7h) Capel Curig 16.4 mm Lake Vyrnwy 10.4 mm ] [Max 18.7C Min 13.9C Grass 12.0 Rain 0.6 mm].

    After midnight on the 6th deep radiation fog fog developed under clear sky. By morning it was still misty with visibility moderate and cloud forming. At 0900 GMT the temperature was 17.7C (dewpoint 16.9C) 95% RH. The grass was very wet with dew and fog deposition. Pressure was on 1015 mb in a generally slack area around Britain, a low was developing W of Ireland 991 mb and the old frontal system was over the Channel and N Sea. Best of the weather where sunny was N Scotland and N northern England. Here mostly cloudy, but North Wales tourist spots in the mountains and beaches on Anglesey were busy (Wisley 30.1C Hawarden 24.5C, Altnaharra 6.0C Mona 10.7C, Plymouth 3.8 mm Sennybridge 1.6 mm, Kinloss 13.9h Aberdaron 2.8h Valley 2.1h) [Max 19.7C Min 13.2C Grass 9.0C Rain 0.6 mm]. There was some rain after midnight on the 7th and still cloudy at dawn, but the sky was clearing slowly at 0900 GMT with cloud lifting from the Snowdonia mountaintops in very good visibility. Pressure 1017 mb was rising with a low 990 mb Iceland and cloud associated with a cold front over Ireland encroaching the north-west. Feeling warm, sunny spells in the afternoon and a sunny evening. Hot at Gorwel Heights, Llanfairfechan 25.3C and the south (Heathrow 36.4C Usk 29.0C, Harris Quidnish 15.7C Aberdaron 17.1C, Exeter 10.4C, Magilligan 14.2 mm, Wattisham 12.1h St Athan 9.9h Valley 5.7h) [Max 22.3C Min 15.8C Rain nil]. A very fine morning on the 8th with just a little contra with cirrostratus far to the SSW, clear very good visibility. Pressure was on 1024 mb and there was a light NE'ly breeze. The fine weather again attracted many people to the beaches with the A55 on to the island at a standstill at times; car parks soon filled up including Llyn Tegid, Penypass and Ogwen. Sunny, but cool in the north hot again in the south (Herstmonceux 34.5C Usk 30.1C, Drumnadrochit 4.3C Mona 12.0C, Lerwick 2.0 mm Aberporth 0.8 mm, Edinburgh 14.3h Valley 13.6h) [Max 22.0C Min 14.2C Rain nil]. A fine and sunny, but breezy morning on the 9th with many leaves falling like snow from the tall trees giving an autumnal look. Beech in particular lost that vivid green colour some while ago, now pale and some quite brown. The soil surface was drying in the wind, but not 100% dry. Pressure was on 1020 mb and it was a warm 18.3C at 0900 GMT. Central England began cloudy and misty, the N Scotland, SE England and Anglesey were sunny. Hot in the south (Herstmonceux 34.0C Hawarden 24.3C, Aboyne 1.5C, Bridlington 0.6 mm, Kirkwall 14.2h Valley 12.8h) [Max 22.0C Min 14.2C Rain nil].

    The 10th began fair, but mostly cloudy with poor visibility. There was a thundery low 1011 mb over the Charente Maritime, France and a trough over Cornwall and NE England. The MetO had issued a yellow warning for thunderstorms, sferics were observed early in the Severn estuary and the NE coast of England. Storms soon spread over Cornwall, S Wales and Aberystwyth where there was flash flooding. Large thunderstorm over the Carneddau and Llanfairfechan with torrential rain at 1450 GMT at Gorwel Heights, 19.2 mm fell in 20 minutes with 24.4 mm in total during the 1 hour event from 1440-1540 GMT and a 24-h total of (26.2 mm). The Aber road out Llanfairfechan was flash flooded and some road surfaces damaged. Gorddinog AWS reported no rain in that hour, but had less intense rain earlier and later with a total of (17.2 mm). Llansadwrn had no rain in the specified hour, but had 1.4 mm from 1450-1510 GMT and a total of (2.0 mm) in the 24-h (00-00 GMT). Heavy thunder was heard in Llansadwrn and frequent lightning seen during the event. A spectacular lightning strike on the Menai Strait near the Anglesey shore was photographed by Rhian Toghill from Caernarfon (Heathrow 35.5C Usk 25.8C, Altnaharra 3.1C, Chivenor 27.8 mm Whitechurch 19.2 mm, Weybourne 13.3h Hawarden 3.9h) [Max 20.7C Min 15.1C Rain 1.8 mm]. Fog developed after midnight on the 11th and with very little wind visibility was still very poor by morning. Pressure 1016 mb in a slack thundery low pressure system. There was fog on the bridges, signs of the fog/ cloud thinning with some weak sunshine developing. Feeling warm the temperature 18.4C with 96% RH. Fog persisted around the coast for a while before the temperature rose to 25.5C at 1429 GMT. Sultry into the evening. Thunder was heard at 2207 GMT and 2218 GMT with lightning in the clouds (Heathrow 35.7C Usk 30.8C Aberporth 17.9C, Kinbrace 5.9C, Morecambe 51.6 mm Lake Vyrnwy 39.6 mm, Bournemouth 12.3h Hawarden 10.9h) [Max 25.5C Min 15.3C Rain nil]. A bright start on the 12th, after an overnight minimum of 15.3C a sunny and warm morning the temperature at 0900 GMT 20.6C and somewhat humid at 92% RH. Tweet about the heavy thunder over the Carneddau Mountains...Visibility was poor in smoke haze level 5 at Marchlyn Mawr with some Saharan dust in the air. A crowd of people in the water at Rhosneigr Bay and visiting other spots in N Wales including Llyn Tegid, Penypass and Ogwen. Thundery lows in Biscay and the Charente Maritime moved north. Continuous heavy thunder was heard to the SE over the Carneddau Mountains from 1425 GMT for about 20 minutes, reminiscent of storms in the South of France. Further thunder and lightning 1500 GMT as the storm moved westward. Before midnight there were sferics recorded all around with flashes in the sky, but no thunder was heard. Hot in the S very wet in Scotland (Heathrow 35.4C Usk 33.5C, Giants Causeway 13.8C Aberporth 21.0C, Magilligan 10.7C, Inverbervie 54.6 mm Llysdinam 18.8 mm, Bournemouth 13.0h St Athan 11.3h Valley 10.0h) [Hereford 48.4 mm Shawbury 33.6 mm Bala 22.2 mm] Rhyl 9.4 mm Capel Curig 8.8 mm] [Max 24.9C Min 15.3C Rain 0.1 mm].

    The 13th began very fine, sunny and warm, at 0900 GMT the temperature was 23.7C with 81% RH. There was thick haze, but visibility was good. The cereal field adjacent to the weather station was sprayed at 1024 GMT. The sky cleared and the afternoon was warm. Sferics were recorded near the tip of Llyn about 20 GMT. Flash flooding due to storms occurred in the Home Counties and M25 (Porthmadog 29.8C, Harris Quidnish 11.2C, Newport (Salop) 38.8 mm Aberdaron 21.4 mm, Morecambe 12.7h Valley 10.4h) [Max 24.8C Min 18.3C Rain 1.6 mm]. After a short heavy shower of rain a 0217 GMT it was another fine and warm morning on the 14th, but with thick haze the visibility was very poor and ozone was moderately high on level 5 at Marchlyn Mawr. Pressure was on 1015 mb with thundery lows 1011 mb NE entrance to the Dover Strait and Atlantic to the south. A warm sunny afternoon (Coton-in-the-Elms 26.5C Porthmadog 25.4C, Lerwick 9.7C/ 13.0C, Cavendish 49.2 mm Tredegar 12.4 mm, Morecambe 12.4h Aberdaron 7.7h) [Max 22.3C Min 16.6C rain nil]. The best of today's weather on the 15th was on Anglesey and NW Wales, beginning with a few lenticular altocumulus clouds. A fresher feel with less humidity 19.7C (dewpoint 16.2C) RH 80% made for a pleasant morning, an autumnal look with many leaves on the grass mainly browned beech. Warm and sunny into the early evening (Porthmadog 25.3C, Stornoway 6.3C Bala 11.0C, Writtle 53.6 mm Mumbles Head 18.2 mm, Valley 12.1h) [Max 23.8C Min 15.3C Rain 2.8 mm].

    The first 15-days of the month have been dry and warm. Rainfall of 35.8 mm (39%) & [41%] of averages, the large fall 23.5 mm on the 4th accounting for most . The mean temperature was above normal 17.6C (+2.4) & [+2.0] of averages. Sunny with a mean of 6.2 hours a day.

    ¤8.5

     



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