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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 dullest parts of Northern Ireland are the upland areas of the north and west, with annual average totals of less than 1100 hours. Mean monthly sunshine figures reach a maximum in May and are at their lowest in December.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.