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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 monthly average temperature in Dublin for July is 71 degrees. The lowest monthly average temperature in Dublin for January is 46 degrees. The most monthly precipitation in Dublin occurs in February with 2.8 inches. The air quality index in Dublin is 3% better than the national average. The pollution index in Dublin is 26% worse than the national average.