VERY WARM JULY DESPITE AVERAGE RAINFALL AND STRONG SUNSHINE
Armagh Observatory, twenty first August 2025: Armagh Observatory studies that July 2025 was a lot hotter than common regardless of roughly common rainfall and practically common sunshine. The month was the equal seventh warmest July on file at Armagh, whereas the four-day heatwave from the tenth to thirteenth of July included the most well liked twelfth of July ever seen within the metropolis.
The month-to-month common temperature, that’s, the typical of the each day most and minimal temperatures, was 17.1 levels Celsius (62.8 Fahrenheit). Regardless of solely common quantities of sturdy sunshine, July 2025 was roughly 2.23 C hotter than the 225-year long-term (1796-2020) common at Armagh (14.87 C) and 1.38 C hotter than the newest (1991-2020) 30-year July common (15.72 C). This was the warmest July at Armagh for 4 years, that’s, because the very heat July 2021 (imply temperature 17.9 C), and the equal seventh warmest July on file at Armagh shared with July 1934.
230 Years of Climate Recording 14 July 2025 Armagh Observatory and Planetarium Armagh CREDIT: LiamMcArdle.com
The common of the each day most air temperatures was 21.06 C, roughly 1.4 C hotter than the corresponding most up-to-date (1991-2020) 30-year July common (19.66 C). Nonetheless, with very barely lower than common quantities of sturdy sunshine and due to this fact with clouds tending to cap each day most temperatures, this was solely the sixteenth warmest such July common on file at Armagh.
The common of the each day minimal air temperatures, which is sort of the identical because the imply of the bottom nighttime air temperatures, was 13.14 C. This was additionally roughly 1.4 C hotter than the corresponding most up-to-date (1991-2020) 30-year July common (11.77 C) however on this case it was the second highest such common on file at Armagh, after the record-breaking July 2013 (common minimal air temperature 13.36 C). On this case, the impact of clouds was to take care of comparatively gentle nighttime air temperatures. Such outcomes illustrate the important thing function of better or lesser quantities of sturdy sunshine, and conversely of lesser or better quantities of cloudiness, in figuring out an necessary meteorological amount, that’s, the each day temperature vary. It’s attention-grabbing to notice that the observer recorded a cloudy or overcast sky on 27 of the 31 days of the month and estimated on 26 days that complete cloud cowl on the time of observations was six or extra oktas.
230 Years of Climate Recording – 14th July. Exhibiting sunshine file for hottest day twelfth July 2025. Armagh Observatory and Planetarium Armagh CREDIT: LiamMcArdle.com
It’s not shocking to search out that the warmest day of the month, specifically 29.7 C on the twelfth, was additionally the sunniest, and the one day of the month with no clouds (zero oktas) recorded on the time of observations. With 12.9 hours of sturdy sunshine, this was the seventh warmest July day on file at Armagh and the most well liked twelfth of July. The six hotter July days at Armagh are 22 July 2021 (31.3 C), 18 July 2022 (31.2 C), 21 July 2021 (30.5 C), 10 July 1934 (30.3 C), 13 July 1983 (30.0 C), and 18 July 2006 (29.9 C). The earlier warmest twelfth of July at Armagh was 29.3 C on 12 July 1983.
The UK Meteorological Workplace defines a warmth wave in Northern Eire to be any interval of no less than three consecutive days when the utmost each day air temperature meets of exceeds 25.0 C (77.0 F). Whereas this situation had been met for a three-day interval starting on the nineteenth of June 2025, it was met once more for a four-day interval starting on the tenth of July 2025. The second heatwave of summer season 2025 provided the 4 warmest days of the month this 12 months at Armagh, specifically 29.7 C on the twelfth, 27.6 C on the eleventh, 27.3 C on the thirteenth, and 25.5 C on the tenth, three of which have been additionally the sunniest. The twelfth of July 2025 (most temperature 29.7 C) was additionally the warmest day of the 12 months at Armagh, surpassing the 29.3 C beforehand achieved on 20 June 2025.
The best day or lowest most air temperature, was a comparatively heat 16.6 C, adopted by 17.3 C on the twenty first and 18.1 C on the twenty third. The best minimal air temperature, normally the warmest evening, was 16.4 C on the thirteenth, adopted by 15.9 C on the 14th and 15.3 C on the twenty fifth. The bottom minimal air temperature, or coolest evening, was 7.4 C on the 2nd, adopted by 9.3 C on the third and 10.0 C on the sixteenth. There have been no air frosts or floor frosts this month, however the lowest grass-minimum temperature was 0.1 C on the 2nd, adopted by 2.3 C on the third and 4.1 C on the sixteenth.
230 Years of Climate Recording 14 July 2025 Armagh Observatory and Planetarium Armagh CREDIT: LiamMcArdle.com
Whole precipitation was 71.9 mm (2.83 inches) together with 4 hint values, that’s, 71.7 mm if hint values are ignored. This was roughly 98% of the 183-year long-term (1838-2020) common July precipitation at Armagh (73.4 mm) and 104% of the marginally decrease most up-to-date (1991-2020) 30-year July common (69.0 mm), making complete rainfall roughly common.
Solely two of the final fifteen months have been considerably wetter than common at Armagh, resulting in a rising concern that except rainfall returns to regular (which ultimately it at all times does) we could quickly be coming into a interval of drought. The wettest day this July was the twentieth with 15.3 mm (0.60 inches) of precipitation, adopted by the twenty first with 15.0 mm and the seventeenth and 18th each with 7.7 mm. Nonetheless, the full rainfall on the twentieth and twenty first (30.3 mm) was a part of the identical climate occasion and occurred inside a single 24-hour interval; it was probability that it was divided nearly equally throughout two meteorological days.
A heavy hail bathe that occurred throughout early afternoon on the 2nd was noteworthy for the dimensions of its hailstones (as much as 9mm throughout) and the statement of rising water vapour as they later melted. Thunder was heard within the early hours of the 14th, and once more round noon the identical day.
A pair of hooded crows was noticed robustly chasing off a buzzard close to the climate station on the morning of the third, and across the time of observations on the seventh one other was seen mobbing a buzzard. The hardly ever noticed behaviour of a thrush ‘anting’ was seen throughout late morning of the ninth. That is when a hen rubs ants or different bugs over its physique, presumably as a type of parasite management. An extra uncommon statement was the pair of jays seen close to the climate station across the time of observations on the twenty seventh and, round noon on the thirty first, the primary sighting of a peacock butterfly.
This month there was a roughly common quantity of sturdy sunshine, the full of 134.2 hours representing practically 99% of the 140-year long-term (1881-2020) July common at Armagh (135.9 hours) and nearly 100% of the newest (1991-2020) 30-year July common (134.8 hours). This was the fourth July in a row at Armagh that has not been sunnier than common. The sunniest day was the twelfth with 12.9 hours of sturdy sunshine, adopted by the eleventh with 12.6 hours, and the thirteenth with 12.1 hours.
These knowledge check with observations at Armagh Observatory, which has been recording the climate at Armagh since 1795.
For additional data, please contact:
Professor Mark E. Bailey
Emeritus Director of Armagh Observatory
Armagh Observatory and Planetarium
Faculty Hill
Armagh
BT61 9DG
