MILD, WET SEPTEMBER WITH ABOUT AVERAGE SUNSHINE


Armagh Observatory, 1st October 2019:

Armagh Observatory reports that September 2019 was warmer and wetter than average, with about average sunshine. This was the sunniest September at Armagh for four years, the warmest for three years and the wettest for two years.

The mean temperature was 13.91 degrees Celsius (57.0 Fahrenheit), approximately 1.4 C warmer than the long-term (1796–2010) average September temperature at Armagh and nearly 0.7 C warmer than the most recent (1981–2010) 30-year September average.

The warmest day (highest maximum air temperature) was 22.3 C (72.1 F), which occurred on the 21st, followed by 22.1 C on the 19th and 21.6 C on the 20th. The coldest day (lowest maximum air temperature) was 12.5 C on the 30th. The warmest night (highest minimum air temperature) was 14.7 C on the 22nd, and the coldest night (lowest minimum air temperature) was 6.3 C on the 18th. There were three ground frosts (grass minimum temperature less than or equal to zero Celsius), the coldest of which was -1.2 C on the 10th.

Total September precipitation was 76.25 mm (3.00 inches), including 1 trace value (i.e. 76.20 mm if trace values are ignored). This is approximately 10% more than the long-term (1838–2010) average September precipitation at Armagh and 12% more than the most recent (1981–2010) 30-year September average at Armagh. The wettest day was the 30th with 20.2 mm (0.80 inches) of rainfall, followed by 12.1 mm on the 21st.

It is interesting to record that a moon halo was noted on the evening of the 13th and a vivid double rainbow on the afternoon of the 26th. Fieldfares were seen on the 2nd of the month, compared with the 14th September the previous year. A lone seagull was noticed flying over the Observatory grounds on the 22nd.

A total of 117.8 hours of strong sunshine were recorded during the month, which is approximately 3% fewer than the long-term (1881–2010) average number of hours of strong September sunshine at Armagh and 3% more than the most recent (1981– 2010) 30-year average. This was the sunniest September at Armagh for four years. The sunniest day, with 10.6 hours of strong sunshine, was the 20th, followed by 10.3 hours on the 17th.

These data refer to observations at Armagh Observatory, which has been recording the weather at Armagh since 1795. For further information, please contact: Professor Mark E. Bailey, Emeritus Director of Armagh Observatory, Armagh Observatory and Planetarium, College Hill, Armagh, BT61 9DG, Tel: 028-3752-2928, E-mail: mark.bailey@armagh.ac.uk


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