COOL, DAMP NOVEMBER, SLIGHTLY LESS SUNNY THAN AVERAGE. AUTUMN COOLER AND A LITTLE SUNNIER THAN AVERAGE, WITH ABOUT AVERAGE RAINFALL

Armagh Observatory, 5th December 2019. Armagh Observatory reports that November 2019 was cooler, wetter and slightly less sunny than average. This was the coolest November at Armagh for three years and the dullest for four years. Autumn as a whole at Armagh was also cooler than average, but a little sunnier than average and with about average precipitation. This was the coolest autumn at Armagh for seven years, the sunniest autumn for nine years and the wettest autumn for five years. The mean monthly temperature was approximately 6.1 degrees Celsius (43.0 Fahrenheit), nearly 0.1 C less than the long-term (1796–2010) average November temperature at Armagh and 0.9 C cooler than most recent (1981–2010) 30-year average.

This was the coolest November at Armagh for three years, that is, since November 2016 (5.5 C). The warmest day (highest maximum air temperature) was 14.2 C on the 1st, followed by 13.8 C on the 3rd. The coldest day (lowest maximum air temperature) was 3.9 C on the 16th, followed by 5.9 C on the 10th. The warmest night (highest minimum air temperature) was 8.6 C on the 1st, and the coldest night (lowest minimum air temperature) was -2.3 C on the 18th, followed by -1.7 C on the 19th. There were 18 ground frosts, the coldest of which was -10.5 C on the 14th, and eight nights with air frost (minimum air temperature less than or equal to zero).

Total precipitation was 82.7 mm (3.26 inches), including 4 trace values, therefore 82.5 mm if trace values are ignored. This is nearly 13% more than the long-term (1838–2010) average November rainfall at Armagh and nearly 11% more than the most recent (1981– 2010) 30-year November average. The wettest day was the 1st, with 15.5 mm (0.61 inches) of rainfall, followed by the 22nd with 11.8 mm. There were 57.4 hours of strong sunshine during the month. This is approximately 10% less than the long-term (1881–2010) average number of hours of strong November sunshine at Armagh but only 1.6% less than the most recent (1981–2010) 30-year November average. The sunniest day was the 3rd with 7.0 hours of strong sunshine, followed by the 8th with 6.3 hours. This was the dullest November at Armagh for four years, that is, since November 2015 (44.4 hours of strong sunshine).

It is interesting to record that a falcon was spotted over the Observatory grounds on the 5th, and seagulls on the 20th. A moon halo was seen on the 7th, and a rainbow on the 20th. Georgian Day (Saturday 30th November) was calm, with long sunny spells in the afternoon.

Taking the three months September, October and November together, the meteorological autumn at Armagh was cooler and slightly sunnier than average, and with about average rainfall. The mean autumn temperature, namely 9.8 C, was approximately 0.4 C warmer than the long-term (1796–2010) autumn temperature at Armagh but 0.33 C cooler than the most recent (1981–2010) 30-year autumn average.

This was the coolest autumn at Armagh for seven years, that is, since autumn 2012 (9.2 C). Total autumn precipitation was 225.20 mm including 10 trace values, which is close to both the long-term (1838–2010) autumn precipitation and the most recent (1981–2010) 30-year average at Armagh. Despite this, it was the the wettest autumn at Armagh for five years, that is, since autumn 2014 (nearly 256 mm).

With a total of 288.5 hours of strong sunshine, the meteorological autumn at Armagh was slightly sunnier than average, being approximately 3% sunnier than the long-term (1881– 2010) average and nearly 10% sunnier than the most recent (1981–2010) 30-year average. This was the sunniest autumn at Armagh for nine years, that is, since autumn 2010.

These data refer to observations at Armagh Observatory, which has been recording the weather at Armagh since 1795. FOR FURTHER INFORMATION PLEASE CONTACT: Mark Bailey at the Armagh Observatory, College Hill, Armagh, BT61 9DG. Tel.: 028-3752-2928; FAX: 028-3752-7174; mark.bailey@armagh.ac.uk; URL: http://climate.armagh.ac.uk/.


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