A wintry beginning with a very mild spell followed by storm Éowyn
Rainfall totalled 129.5 mm ranking as one of the 34 wettest Januaries in Llansadwrn since records began in 1928. Least since 2022 it was (105%) of the decadal average that had seen some very wet Januaries (180.6 mm in 2021), and [125%] of the somewhat drier 1991-2020 period average. The wettest day was on the 5th with 19.2 mm much falling as ice precipitation. There were 6 days with no precipitation (+1.9); 19 dry days (+2.2); 21 rain days (-2.2); 15 wet days (-1.1); and 9 (+1.0) with 5 mm, or more. At Gorwel Heights in Llanfairfechan rainfall of 136.0 mm (119%) & [153%] of averages was least since 2022, here the wettest day was on the 23rd with 30.6 mm while the 5th saw 30.4 mm. Here there were 8 dry days; 23 rain days; 17 wet days; and 7 had 5 mm, or more. Rainfall duration (wet hours) was 131 h at Gorwel heights and 128 h in Llansadwrn. The mean temperature 5.0C in Llansadwrn (-0.7) & [-0.4[ of averages was lowest since 2021 and the 17th lowest in records since 1979. The mean maximum was 7.3C
with the highest maximum 11.9C on the 16th and the lowest 2.0C on the 8th. The mean minimum was 2.6C
with the lowest minima -2.2C on the 9th and -1.4C on the 10th resulting in 23.2 hours of frost the only two days of air frost recorded. There were 19 days of ground frost (+2.2)
with the lowest -6.2C on the 9th. An air frost of -0.9C was also recorded at Gorwel Heights on the 9th with 6.5h of frost recorded. Here the mean minimum was 3.5C with the highest 10.5C on the 14th
. The mean maximum was 8.0C with the highest 13.2C on the 14th and lowest 3.3C on the 8th. The mean 5.8C was (-0.8) & [-0.4] of averages was lowest since 2021. Gorwel Heights had extreme wind speeds on the 24th for 3 hours between 0120 and 0410 GMT recording a high gust of 76 mph. At 0240 GMT a 10 min (height corrected) mean wind speed of 47 mph force 9 was recorded, likely responsible for blowing over a long length of brick wall. The highest gusts in Llansadwrn were 58 mph at 0220 GMT and 57 mph at 0740 GMT. Between 0220 and 1000 GMT 20 gusts of 50 mph, or more, were recorded. The wind resulted in the removal of several roof slates. This was the windiest spell recorded at the stations since before 2010.
February 2025Quite a dry and sunny month with temperatures above the 30-y climatological averagesArea gales at the beginning and end of the month, little wintriness occurred and it was sunny at the end A dry month the 55.8 mm of rainfall just (51%) of that received in the last 10 years, but was [62%] of the 1991-2020 average. Least since 2023 and ranking 37th lowest since 1928. The wettest day was on the 23rd when 14.6 mm fell. There were 8 (+1.5) days with no precipitation and 10 (+1.1) dry days. Rain days were 18 (-1.4); wet days 11 (-2.45); and only 4 days (-3.1) had 5 mm, or more. Gorwel Heights in Llanfairfechan was a little drier with 48.6 mm (52%) & [65%] of averages least since 2022, here the wettest day was on the 23rd with 13.8 mm while Gorddinog had a total of 59.8 mm with the most 14.8 mm. Rainfall duration (wet hours) was 58h at Gorwel Heights and 72h in Llansadwrn. The mean temperature 6.5C (+0.2) & [+0.9] of averages was lowest since 2021, but was ranked 13th highest in records back to 1979. The mean maximum was 8.8C the highest 13.4 on the 20th and lowest 4.5C on the 13th. The mean minimum was 4.1C with the lowest 0.2C on the 14th that also had the lowest grass minimum of -4.2C. There was no air frost, but there were 10 days of ground frost. Gorwel Heights in Llanfairfechan had a mean temperature of 7.1C (+0.1) & [+1.2] of averages, lowest since 2021.. The mean maximum was 9.2|C with the highest 16.2C on the 20th and lowest 4.4C on the 10th. The mean minimum was 5.0C with the highest 11.8C on the 21st and lowest 1.6C on the 14th. A high gust of 65 mph was recorded at Gorwel heights on the 23rd. A sunny month at RAF Valley with 95.0h (provisional) highest since 2019 and ranking 19th on the Anglesey record since 1931. The sunniest day was the last day the 28th having 9.9h and there were 7 sunless days. Winter 2024/25Temperature close to decadal averages and above 30-y averages Rainfall below decadal averages and above 30-y average
Monthly data 2025
Llanfairfechan, Gorwel Heights observations
AcknowledgementsThe Met Office at RAF Valley kindly supplied observational data from 1942 to 2011. Current data (provisional) are gathered from SYNOP reports and METAR, final data from the Met Office website. I am grateful to David Lee for use of his data from Gorddinog.
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