Coldest September for twenty years


Armagh Observatory reports that September’s weather was the coldest it has been for 20 years. On a brighter note it was drier and slightly sunnier.

The mean temperature was slightly less than 12.8 degrees Celsius.

The result contrasts with each of the last two Septembers, and indeed most Septembers during the last 20 years. This September’s mean temperature was 0.5 degrees C cooler than the most recent 30-year (1981-2010) average September at Armagh, namely 13.25 C. There were four ground frosts, the coldest of which (-1.2 C) occurred on the 28th. There were no air frosts. The warmest day was 21.4 C, which occurred on the 29th, and the coldest night was 3.4 degrees Celsius on the 16th.

September was also slightly sunnier than average, with a total of 125 hours of strong sunshine recorded at Armagh. Although this was only 9.6 per cent more than the most recent 30-year (1981-2010) average number of hours of strong sunshine (114.0 hours), the month was the sunniest September for 18 years.