The first official sign of autumn was recorded in Roscommon earlier this month.
Met Eireann has confirmed that the first autumn air frost, signalling the end of summer, occurred last weekend. The weather station at Mount Dillon recorded a daily minimum air temperature of -0.5°C.
The First Frost is the first air frost observed in Autumn when the daily minimum air temperature goes below 0°C at a meteorological or climatological station. Only one occurrence of air frost in July ever took place when -0.3°C was observed at Mostrim, Co Longford on Monday 8 July 1889.
There have been two instances of the First Frost occurring in an August, the last being Mount Dillon observed -0.6°C on Monday 30 August 2010 and the other is the August national minimum air temperature record of -2.7°C observed at Rathdrum, Co Wicklow on Sunday 30 August 1964.
Sep & Oct often bring the first thought of air frost, reminding us that summer is over, and winter is on its way. The first autumn air frost occurred last weekend, on Sat 17 Sep at Mount Dillon, Co Roscommon with a daily minTa of -0.5°C.
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— Irish Observational Climatology (@METclimate) September 22, 2022