WARM, DRY OCTOBER, DULLEST FOR 71 YEARS

Armagh Observatory, 2nd November 2017: Armagh Observatory reports that October 2017 was drier and much warmer than average, but the dullest October at Armagh since 1946.

The average temperature was approximately 11.7 degrees Celsius (53.0 Fahrenheit), which is 2.2 C warmer than the long-term (1796-2010) average October temperature at Armagh and 1.5 C warmer than the most recent (1981-2010) 30-year average. This was the warmest October at Armagh for four years, that is, since October 2013, which had nearly the same mean temperature. Halloween (31st October) was again mild.

The warmest day (highest maximum air temperature) was 18.6 C, which occurred on the 15th, and the coldest day (lowest maximum air temperature) was 11.9 C on the 30th. The warmest night (highest minimum air temperature) was 12.7 C on the 15th, and the coldest night (lowest minimum air temperature) was 1.7 C on the 30th. There were 5 ground frosts, the coldest of which was -4.0 C, which occurred on the 30th. There were no air frosts.

Total precipitation was 66.8 mm (2.63 inches), including six trace values, which is approximately 83% of the long-term (1838-2010) average October precipitation at Armagh (80.22 mm) and 78% of the most recent (1981-2010) 30-year average October precipitation at Armagh (85.63 mm). The wettest day was the 19th, with 15.8 mm (0.62 inches) of rainfall. The former hurricane Ophelia, which crossed the island of Ireland on the 16th, brought strong winds to Armagh that afternoon, but relatively little rain.

With a total of 58.8 hours of strong sunshine, October 2017 was much duller than average. This was the dullest October at Armagh for 71 years, that is, since October 1946, and the fifth dullest October at Armagh since sunshine records began in 1881. The long-term (1881-2010) average number of hours of strong sunshine in October at Armagh is approximately 94.2 hours, and the most recent (1981-2010) 30-year average is around 90.2 hours, so October 2017 registered only around three-fifths of the expected sunshine for the month. The sunniest day, with 7.5 hours of strong sunshine, was the 5th.

A rainbow was seen on the afternoon of the 17th, and geese were observed flying over Armagh on the morning of the 16th October and also the evening of the 26th. Given that the month was warmer and drier than average, the persistent very damp ground conditions were probably due to the lack of strong sunshine.

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; mebat signarm.ac.uk; URL: http://climate.arm.ac.uk

Last Revised: 2017 November 10th