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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.
Dublin Climate & Temperature. 1  Dublin, Ireland is at 53 25'N, 6 15'W, 85 m (279 ft). 2  See map. 3  Dublin has a marine west coast climate that is mild with no dry season, warm summers.4  Heavy precipitation occurs during mild winters which are dominated by mid-latitude cyclones. In the winter time records indicate temperatures by day reach 7.8Â°C (46.1Â°F) on average falling to 2.8Â°C (37Â°F) overnight. 2  In spring time temperatures climb reaching 11.7Â°C (53.1Â°F) generally in the afternoon with overnight lows of 4.8Â°C (40.6Â°F).