COOL SEPTEMBER, DRIER AND MUCH SUNNIER THAN AVERAGE
Armagh Observatory reviews that September 2024 was cooler than common however drier and far sunnier. It was the best September at Armagh for six years, the driest for 4 years, and the sunniest for 27 years.
The typical 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 best 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 throughout the week starting the 14th. The three warmest days (highest most air temperature) have been the seventh, with an unremarkable 25.0 C however however the warmest day of the 12 months, adopted by the sixth (23.9 C) and the seventeenth (23.5 C).
It’s uncommon that the warmest days of the 12 months ought to happen in September and June, although this occurred each final 12 months and this. Final 12 months, the three warmest days have been the thirteenth of June and the eighth of September, each 28.5 C, adopted by the sixteenth of June (26.9 C). This 12 months, the three warmest days have 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 evening, was 15.3 C. This was attributed to the 2nd regardless of the worth occurring initially 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 initially of the meteorological day, that’s, at 09:00 GMT on the fifth.
The bottom minimal air temperature, or coolest evening, 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 have 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 just isn’t statistically vital.
Though September rainfall at Armagh reveals the standard obvious decadal oscillations and might range considerably from one 12 months to a different, it appears that evidently to a primary approximation it has not considerably modified over the practically 200 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 accordance with the UK Meteorological Workplace ten English counties skilled their wettest Septembers on document, the primary three weeks of September at Armagh provided complete precipitation amounting to only 10.6 mm and solely seven days had complete rainfall better than or equal to 0.2 mm. Conversely, the final week provided 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 have been seen chasing off a buzzard on the morning of the twenty fifth.
There have been 137.8 hours of robust sunshine throughout the month. That is roughly 23% greater than the 140-year (1881-2020) long-term common robust 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 robust sunshine was recorded throughout September 1997. The sunniest days have been the 18th (11.2 hours), the twelfth (10.3 hours), and the eleventh (9.9 hours).
These knowledge confer 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
School Hill
Armagh
BT61 9DG
