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The coldest areas are found inland. Mullingar has the lowest average temperature, at 9.3 Â°C. The highest temperature ever recorded in Ireland was 33.3 Â°C at Kilkenny Castle, on 26 June 1887. The lowest temperature was -19.1 Â°C at Markree Castle on 16 January 1881. Although Ireland has no mountain-based meteorological station, it is almost certain its mountains have seen temperatures of -25 Â°C.
The highest known monthly sunshine total in Northern Ireland is 298 hours recorded at Mount Stewart (County Down) in June 1940. The highest UK monthly total is 383.9 hours at Eastbourne in July 1911.he mean annual temperature decreases by approximately 0.5 Â°C for each 100 metres increase in height so that, for example, Parkmore Forest in County Antrim (at 235 metres) has an annual mean temperature of 7.7 Â°C. On this basis, Slieve Donard (at 852 metres) would have an annual mean temperature of about 4.5 Â°C.