COOL SEPTEMBER, DRIER AND MUCH SUNNIER THAN AVERAGE
Armagh Observatory stories that September 2024 was cooler than common however drier and far sunnier. It was the good September at Armagh for six years, the driest for 4 years, and the sunniest for 27 years.
The common temperature was 13.1 levels Celsius (55.6 levels Fahrenheit). This is roughly 0.6 C hotter than the 225-year long-term (1796-2020) common for September at Armagh (12.5 C) and 0.4 C cooler than the newest (1991-2020) 30-year common (13.5 C). This was the good September at Armagh since September 2018 (12.6 C).
Regardless of this there have been a number of comparatively heat days, notably a short interval of ‘summer time’ from the fifth to the seventh and once more through the week starting the 14th. The three warmest days (highest most air temperature) had been the seventh, with an unremarkable 25.0 C however however the warmest day of the yr, adopted by the sixth (23.9 C) and the seventeenth (23.5 C).
It’s uncommon that the warmest days of the yr ought to happen in September and June, although this occurred each final yr and this. Final yr, the three warmest days had been the thirteenth of June and the eighth of September, each 28.5 C, adopted by the sixteenth of June (26.9 C). This yr, the three warmest days had been the seventh of September (25.0 C), adopted by the twenty fourth of June (24.8 C) and the nineteenth of July (24.3 C).
The best minimal air temperature, normally the warmest night time, was 15.3 C. This was attributed to the 2nd regardless of the worth occurring at the start of the 24-hour ‘meteorological day’ operating from 09:00 GMT on the first to 09:00 GMT on the 2nd, the day of observations. The second highest minimal air temperature was 13.4 C on the seventeenth; and this was adopted by 13.1 C, attributed to the sixth. Once more, this worth occurred at the start of the meteorological day, that’s, at 09:00 GMT on the fifth.
The bottom minimal air temperature, or coolest night time, was 3.1 C on the twenty fifth, adopted by 3.2 C on the thirteenth, and 5.2 C on the twenty eighth.
The bottom most air temperature, or coolest day, was a chilly 9.9 C on the twenty sixth, adopted by 13.1 C on the twenty fifth and 13.6 C on the twenty seventh. The twenty sixth was the coldest September day at Armagh for 12 years, that’s, because the twenty fourth of September 2012 (lowest most temperature additionally 9.9 C).
There have been 5 floor frosts, that’s, nights with minimal grass temperatures lower than or equal to zero Celsius. The three lowest grass temperatures had been -3.2 C on the twenty fifth, -2.3 C on the thirteenth, and -1.6 C on the twenty eighth.
Complete precipitation this month was 57.0 mm (2.24 inches) together with six hint values, that’s, 56.7 mm if hint values are ignored. That is roughly 83% of the 183-year long-term (1838-2020) common September rainfall at Armagh (68.9 mm) and 88% of the newest (1991-2020) 30-year common (65.0 mm). It’s noteworthy that the (1991-2020) 30-year common September rainfall is barely lower than the 183-year long-term common though on this case the distinction is just not statistically important.
Though September rainfall at Armagh exhibits the standard obvious decadal oscillations and may fluctuate considerably from one yr to a different, evidently to a primary approximation it has not considerably modified over the practically 2 hundred years of observations at Armagh.
The wettest day was the twenty fifth with 24.5 mm of precipitation, adopted by the twenty sixth with 13.7 mm, and the thirtieth with 6.1 mm. In distinction to the very moist September in components of southern England this month, the place in line with the UK Meteorological Workplace ten English counties skilled their wettest Septembers on document, the primary three weeks of September at Armagh equipped complete precipitation amounting to simply 10.6 mm and solely seven days had complete rainfall larger than or equal to 0.2 mm. Conversely, the final week equipped 46.1 mm of precipitation, thrice the corresponding (1991-2020) 30-year common. Regardless of the moist finish to the month, this September was the driest at Armagh for 4 years, that’s, since September 2020 (49.2 mm together with 4 hint values).
There have been no named storms this September, however hail was reported on the eleventh and a rainbow was seen on the twenty seventh. A rook and a jackdaw had been seen chasing off a buzzard on the morning of the twenty fifth.
There have been 137.8 hours of sturdy sunshine through the month. That is roughly 23% greater than the 140-year (1881-2020) long-term common sturdy sunshine at Armagh (112.1 hours) and 21% greater than the newest (1991-2020) 30-year common (114.4 hours). This was the sunniest September at Armagh for 27 years, that’s, since 138.8 hours of sturdy sunshine was recorded throughout September 1997. The sunniest days had been the 18th (11.2 hours), the twelfth (10.3 hours), and the eleventh (9.9 hours).
These knowledge discuss with observations at Armagh Observatory, which has been recording the climate at Armagh since 1795.
For additional info, please contact:
Professor Mark E. Bailey
Emeritus Director of Armagh Observatory
Armagh Observatory and Planetarium
Faculty Hill
Armagh
BT61 9DG
