AUGUST 2025 MUCH WARMER THAN AVERAGE AT ARMAGH, SUNNIER AND MUCH DRIER. EQUAL WARMEST SUMMER ON RECORD AT ARMAGH, DRIER THAN AVERAGE BUT WITH AVERAGE SUNSHINE
Armagh Observatory, eighth September 2025: Armagh Observatory studies that August 2025 at Armagh was a lot hotter than common, and sunnier and far drier than common. Taking June, July, and August collectively, the meteorological summer season 2025 was the equal warmest on file at Armagh, shared with summer season 1995, and drier than common however with about common sunshine.
With a median temperature of 17.0 levels Celsius (62.6 Fahrenheit), shared with these of August 1983, 1955, and 2022, August 2025 was virtually 2.4 C hotter than the (1796-2020) 225-year long-term common August temperature at Armagh (14.6 C) and roughly 1.5 C hotter than the most up-to-date (1991-2020) 30-year August common (15.5 C). These 4 Augusts at the moment are the equal fourth warmest Augusts on file at Armagh, following August 1995 (common temperature 18.2 C), 1947 (common August temperature 17.4 C), and 1997 (common temperature 17.1 C). The following cooler Augusts are 1976 and 1899 (each with common temperatures of 16.8 C).
Common August temperatures at Armagh have elevated considerably over the final thirty years or so. The (1961-1990) 30-year August common was 14.8 C, in contrast with the newest (1991-2020) 30-year common of 15.5 C, a rise of roughly 0.2 C per decade. Of the final ten Augusts at Armagh solely three have decrease common temperatures than 15.5 C.
The warmest day (highest most air temperature) was 27.9 C on the twelfth, one of many three sunniest days of the month at Armagh. This was adopted by 26.4 C on the thirteenth (the sunniest day), and 24.9 C on the twenty fifth. The best day (lowest most air temperature) was 16.6 C on the twenty eighth, adopted by the first and 4th (each with 18.2 C). The very best minimal air temperature, notionally the warmest night time, was 16.6 C on the twenty fourth, adopted by 15.9 C shortly after the time of observations (09:00 GMT) on the 2nd however attributed to the third, and by 15.8 C, additionally shortly after the time of observations on the twenty second however attributed to the twenty third. The bottom minimal air temperature, or coolest night time, was 8.3 C on the twenty first adopted by 9.1 C on the tenth, and 10.2 C on the sixth.
The month-to-month common of the day by day most air temperatures was almost 21.2 C. That is roughly 1.8 C hotter than the corresponding most current (1991-2020) 30-year August common (19.4 C) and the ninth warmest such common on file at Armagh. Conversely, the month-to-month common of the day by day minimal air temperatures, normally the bottom nighttime temperatures, was roughly 12.8 C. That is 1.2 C hotter than the corresponding most up-to-date 1991-2020) 30-year August common (11.6 C) and the second warmest such common on file at Armagh, following August 1997 (corresponding common 13.3 C) and shared with 1955 and 1990.
The distinction within the rating of the month-to-month common day by day most temperatures in contrast with that of the day by day minimal temperatures may be understood as an impact of clouds: bigger quantities of cloud are likely to restrict day by day temperature maxima while elevating lowest nighttime minima. Had this August been relatively much less cloudy, not solely would the common temperature have been better with the best day by day most temperatures boosted by robust sunshine, however the lowest nighttime temperatures would have been barely decrease owing to clearer skies at night time.
The bottom grass-minimum temperature was 2.6 C on the tenth, adopted by 2.9 C on the twenty first and 5.1 C on the seventeenth. There have been no frosts this August.
In contrast to August 2023 and August 2024, this August 2025 was dominated by higher-than-average atmospheric stress, resulting in settled and largely dry climate situations. Other than a quick spell of windy climate on the 4th, attributable to the passage throughout Scotland of the unusually deep and energetic summer season despair named Storm Floris, the climate remained largely dry and settled till the arrival of one other deep space of low stress on the twenty fifth related to ex-hurricane Erin. This launched unsettled situations lasting to the top of the month and into early September.
The imply atmospheric stress lowered to imply sea stage this month was 1015 mbar, barely larger than the 170-year (1851-2020) long-term August common of 1014 mbar. The very best 09:00 GMT atmospheric stress lowered to imply sea stage at Armagh was 1029.6 mbar on the sixteenth, and the lowest was 990.1 mbar on the thirty first.
Roughly 30 gulls had been noticed flying in a “V” formation in a north-easterly course on the 2nd, and swallows had been recorded on the fifth. The annual Perseid meteor bathe was noticed on the twelfth.
Raindrops, noticed on the afternoon of the twenty fifth, presaged a change in the climate to breezy, extra unsettled situations. Rainbows had been recorded on the evenings of the twenty ninth and thirtieth.
Whole rainfall was 29.0 mm together with 6 hint values, that’s, 28.7 mm if hint values are ignored. That is roughly 35% of the 183-year long-term (1838-2020) common August precipitation at Armagh (82.35 mm) and 37% of the newest (1991-2020) 30-year common (78.6 mm). August 2025 was subsequently a lot drier than common, with simply 9 rain days, outlined as days with precipitation of no less than 0.2 mm. This was the thirteenth driest August on file at Armagh and the driest because the very dry August 2022 (24.9 mm). Had the sample of climate not modified with the arrival of ex-hurricane Erin, the month would have been very dry certainly. Whole precipitation over the past six days of the month amounted to 24.4 mm, almost 85% of the month-to-month complete.
The wettest day was the twenty sixth, with 9.5 mm (0.37 inches) of rainfall, adopted by the thirty first with 5.7 mm and the thirtieth with 4.9 mm.
With a complete of 153.6 hours of robust sunshine, August 2025 was sunnier than common, with roughly 15% greater than the 140-year (1881-2020) long-term August common at Armagh (133.1 hours) and 9% greater than the most up-to-date (1991-2020) 30-year common (140.6 hours). August was the solely month this summer season to be sunnier than common.
Contemplating the three months June, July, and August collectively, the meteorological summer season 2025 had a median temperature of 16.5 C. This was the equal warmest summer season on file at Armagh, shared with summer season 1995. It was additionally drier than common however with common sunshine. The few warmest summers at Armagh at the moment are 2025 and 1995, each with common summer season temperatures of 16.5 C, adopted by 2006 (16.3 C) after which 1983, 2023, 2021, 2018, 1826 and 2013 (all roughly 16.2 C).
The typical summer season temperature was roughly 2.2 C hotter than the 225-year (1796-2020) long-term common summer season temperature at Armagh (14.3 C) and 1.4 C hotter than the newest (1991-2020) 30-year common (15.1 C). The three warmest days at Armagh this summer season had been 29.7 C (twelfth July), 29.3 C (twentieth June), and 27.9 C (twelfth August). There had been two heatwaves (sequences of three or extra days with most temperatures better than or equal to 25.0 C), specifically the nineteenth to the twenty first of June and the tenth to the thirteenth of July.
With June wetter than common, July with roughly common precipitation, and August a lot drier than common, complete summer season precipitation (188.9 mm together with 12 hint values) was lower than common, supplying 86% of the 183-year (1838-1990) long-term summer season common at Armagh (219.4 mm) and 89.7% of the newest (1991-2020) 30-year common (219.4 mm). This was in no way the driest summer season on file, for instance the three driest summers at Armagh are 1995 (80 mm), 1983 (88 mm), and 1870 (92 mm).
Equally, though June was barely duller than common and July had roughly common sunshine, the marginally sunnier than common August led to summer season 2025 being near common as far as robust sunshine is involved. The summer season complete of 422.6 hours of robust sunshine was roughly 99% of the 140-year (1881-2020) long-term common summer season sunshine at Armagh (426.7 hours) and 101% of the newest (1991-2020) 30-year common (420.0 hours).
These information discuss with observations at Armagh Observatory, which has been recording the climate since 1795.
For additional info, please contact:
Professor Mark E. Bailey
Emeritus Director of Armagh Observatory
Armagh Observatory and Planetarium
School Hill
Armagh
BT61 9DG
Tel: 028-3752-2928
E-mail: mark.bailey@armagh.ac.uk
