Areal values from HadUK-Grid 1km gridded climate data from land surface network Source: Met Office National Climate Information Centre Monthly, seasonal and annual number of days in the month with air frost (minimum temperature below zero) for Northern Ireland Areal series, starting in 1960 Last updated 01-Mar-2024 10:46 year jan feb mar apr may jun jul aug sep oct nov dec win spr sum aut ann 1960 14.8 19.2 3.0 1.4 0.1 0.0 0.0 0.0 0.0 0.1 3.3 15.7 --- 4.4 0.0 3.4 57.5 1961 11.5 3.1 0.7 3.5 0.1 0.0 0.0 0.0 0.0 0.0 5.1 19.1 30.3 4.3 0.0 5.1 43.1 1962 11.8 7.0 18.5 6.5 0.3 0.4 0.0 0.0 0.0 0.4 4.8 9.8 37.9 25.2 0.4 5.2 59.4 1963 27.0 22.7 8.7 2.6 0.2 0.0 0.0 0.0 0.1 0.0 5.7 11.4 59.5 11.5 0.0 5.8 78.4 1964 4.1 9.8 7.7 2.4 0.0 0.0 0.0 0.0 0.0 1.2 5.4 11.5 25.3 10.1 0.0 6.7 42.3 1965 15.9 11.6 8.7 1.5 1.7 0.0 0.0 0.0 0.0 0.4 11.9 9.3 39.0 11.9 0.0 12.3 61.1 1966 12.9 5.9 3.8 6.4 0.0 0.0 0.0 0.0 0.0 1.6 8.5 5.5 28.1 10.2 0.0 10.0 44.6 1967 7.9 6.0 4.3 3.7 2.4 0.0 0.0 0.0 0.0 0.2 5.7 9.3 19.3 10.4 0.0 5.9 39.4 1968 8.9 21.8 8.0 9.3 2.9 0.0 0.0 0.0 0.0 0.0 4.7 13.6 39.9 20.3 0.0 4.7 69.2 1969 10.0 18.0 14.7 8.0 0.5 0.0 0.0 0.0 0.1 0.2 14.7 12.5 41.6 23.2 0.0 15.0 78.7 1970 11.3 17.4 13.0 8.5 0.0 0.0 0.0 0.0 0.0 0.0 6.0 8.1 41.1 21.5 0.0 6.0 64.2 1971 8.8 7.6 8.1 3.9 0.4 0.0 0.0 0.0 0.3 1.4 7.1 5.3 24.6 12.4 0.0 8.8 43.0 1972 11.6 7.2 9.6 2.1 0.1 0.0 0.0 0.0 0.6 0.1 7.5 9.6 24.0 11.7 0.0 8.3 48.4 1973 6.4 10.5 9.3 5.3 2.5 0.0 0.0 0.0 0.0 2.4 8.1 8.1 26.5 17.2 0.0 10.5 52.7 1974 6.1 7.1 8.8 3.8 0.3 0.0 0.0 0.0 0.8 0.1 6.1 1.4 21.3 12.8 0.0 6.9 34.3 1975 6.9 6.0 10.5 5.3 1.3 0.4 0.0 0.0 0.4 0.9 3.7 5.2 14.3 17.1 0.4 5.1 40.6 1976 7.3 7.6 8.1 3.5 0.1 0.0 0.0 0.0 0.0 0.5 6.3 17.2 20.0 11.8 0.0 6.8 50.6 1977 16.9 10.4 2.1 5.3 2.4 0.0 0.0 0.0 0.1 0.0 8.7 2.8 44.5 9.8 0.0 8.9 48.9 1978 13.5 13.2 6.4 6.1 0.4 0.0 0.0 0.0 0.0 0.0 4.5 9.1 29.6 13.0 0.0 4.5 53.3 1979 24.7 17.7 13.6 4.7 5.7 0.0 0.0 0.0 0.1 0.3 6.5 11.5 51.5 24.0 0.0 6.8 84.7 1980 17.6 8.4 11.5 1.9 0.2 0.0 0.0 0.0 0.0 0.6 5.8 9.1 37.5 13.6 0.0 6.4 55.1 1981 7.8 10.8 3.8 3.8 1.4 0.0 0.0 0.0 0.0 3.8 2.6 16.2 27.7 8.9 0.0 6.4 50.1 1982 13.1 8.5 6.1 2.8 2.9 0.0 0.0 0.0 0.0 0.3 5.0 14.9 37.7 11.8 0.0 5.4 53.6 1983 5.5 13.5 4.3 11.4 0.2 0.0 0.0 0.0 0.0 1.9 5.4 3.9 33.8 15.9 0.0 7.3 46.0 1984 19.0 8.5 10.7 4.9 2.4 0.0 0.0 0.0 0.1 1.9 6.3 7.1 31.4 17.9 0.0 8.2 60.8 1985 24.5 13.0 11.3 2.0 0.3 0.0 0.0 0.0 0.0 0.1 15.1 6.9 44.6 13.5 0.0 15.2 73.0 1986 14.9 21.0 9.5 8.9 0.0 0.0 0.0 0.0 0.6 0.1 3.8 9.0 42.7 18.5 0.0 4.5 67.9 1987 15.8 13.8 11.4 1.9 0.2 0.0 0.0 0.0 0.0 2.7 2.7 6.1 38.6 13.6 0.0 5.5 54.8 1988 9.9 9.6 3.4 3.1 0.5 0.0 0.0 0.0 0.0 2.5 7.2 0.1 25.7 7.0 0.0 9.7 36.4 1989 2.9 7.7 6.7 7.7 0.2 0.0 0.0 0.0 0.0 0.0 4.3 10.7 10.7 14.5 0.0 4.3 40.1 1990 4.0 5.7 2.0 2.6 0.0 0.0 0.0 0.0 0.0 0.0 7.0 12.4 20.4 4.7 0.0 7.0 33.8 1991 16.0 17.2 3.7 1.0 0.6 0.2 0.0 0.0 0.3 0.0 5.1 3.5 45.6 5.3 0.2 5.4 47.6 1992 7.4 6.7 1.0 0.7 0.1 0.0 0.0 0.0 0.0 3.3 3.1 11.1 17.6 1.9 0.0 6.4 33.4 1993 5.4 3.7 6.4 0.8 1.6 0.0 0.0 0.0 0.0 5.9 9.3 9.0 20.2 8.9 0.0 15.2 42.2 1994 9.6 10.8 2.4 3.5 0.3 0.0 0.0 0.0 0.0 0.4 0.3 6.4 29.4 6.2 0.0 0.7 33.8 1995 12.7 4.1 11.5 3.6 1.7 0.0 0.0 0.0 0.0 0.0 3.1 13.0 23.3 16.8 0.0 3.1 49.8 1996 4.7 18.2 5.1 4.4 3.5 0.0 0.0 0.0 0.0 0.0 12.5 12.6 35.9 13.1 0.0 12.5 61.0 1997 12.5 5.2 5.1 1.8 1.1 0.0 0.0 0.0 0.0 0.6 3.2 3.6 30.3 8.0 0.0 3.9 33.2 1998 9.9 3.0 2.3 5.9 0.0 0.0 0.0 0.0 0.0 0.3 3.1 7.6 16.5 8.2 0.0 3.4 32.2 1999 8.1 6.2 4.9 5.0 0.0 0.0 0.0 0.0 0.0 0.0 1.8 8.8 21.8 10.0 0.0 1.8 34.9 2000 5.7 4.6 3.2 6.0 0.1 0.0 0.0 0.0 0.0 0.4 3.3 10.4 19.2 9.4 0.0 3.8 33.9 2001 13.9 13.7 11.4 2.7 0.2 0.0 0.0 0.0 0.0 0.0 0.6 11.2 37.9 14.3 0.0 0.7 53.8 2002 2.9 4.4 5.8 4.0 0.2 0.0 0.0 0.0 0.0 2.5 0.3 5.5 18.5 10.0 0.0 2.8 25.5 2003 10.9 10.7 7.1 2.5 0.1 0.0 0.0 0.0 0.0 2.8 2.1 8.9 27.1 9.7 0.0 4.9 45.2 2004 7.2 12.5 5.6 0.6 0.0 0.0 0.0 0.0 0.0 1.2 1.8 5.9 28.6 6.2 0.0 3.1 34.8 2005 4.5 7.5 5.9 1.7 0.5 0.0 0.0 0.0 0.0 0.0 6.6 7.3 17.9 8.1 0.0 6.6 34.1 2006 7.4 10.5 10.3 3.2 0.4 0.0 0.0 0.0 0.0 0.0 2.3 4.2 25.2 13.9 0.0 2.3 38.2 2007 5.0 8.4 5.2 1.1 0.4 0.0 0.0 0.0 0.3 0.3 2.0 5.1 17.6 6.7 0.0 2.6 27.8 2008 6.0 8.7 5.1 4.0 0.1 0.0 0.0 0.0 0.0 1.4 3.6 14.1 19.8 9.2 0.0 5.0 43.0 2009 14.0 11.0 5.2 0.3 0.1 0.0 0.0 0.0 0.0 0.2 3.5 16.5 39.1 5.5 0.0 3.7 50.7 2010 16.8 18.5 12.6 5.5 1.5 0.0 0.0 0.0 0.1 2.3 12.7 23.1 51.7 19.6 0.0 15.1 93.1 2011 17.2 6.1 9.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.4 6.4 46.4 9.5 0.0 1.4 40.6 2012 3.8 4.9 3.0 4.9 1.4 0.0 0.0 0.0 0.2 1.6 6.4 9.4 15.1 9.3 0.0 8.2 35.6 2013 9.2 10.5 16.2 6.8 0.3 0.0 0.0 0.0 0.0 0.2 4.4 3.8 29.1 23.3 0.0 4.7 51.5 2014 5.1 6.5 6.9 1.1 0.0 0.0 0.0 0.0 0.0 0.3 1.3 7.7 15.4 8.0 0.0 1.6 28.9 2015 12.6 9.6 9.2 3.5 1.0 0.0 0.0 0.0 0.0 0.3 1.3 3.1 29.9 13.8 0.0 1.7 40.7 2016 8.3 11.7 5.3 6.0 0.3 0.0 0.0 0.0 0.0 0.2 8.4 2.6 23.1 11.6 0.0 8.6 42.9 2017 8.8 7.1 5.2 0.6 0.1 0.0 0.0 0.0 0.0 0.0 3.6 10.4 18.5 5.9 0.0 3.7 35.9 2018 9.5 15.8 12.6 3.8 0.1 0.0 0.0 0.0 0.1 2.5 2.1 2.4 35.7 16.4 0.0 4.7 48.8 2019 8.1 5.0 2.7 1.3 1.3 0.0 0.0 0.0 0.0 1.9 7.0 5.8 15.6 5.3 0.0 8.9 33.1 2020 5.3 4.8 7.6 1.9 1.8 0.0 0.0 0.0 0.5 0.1 0.7 7.4 15.8 11.4 0.0 1.3 30.2 2021 15.5 6.2 2.9 9.0 2.6 0.0 0.0 0.0 0.0 0.0 1.1 1.0 29.2 14.5 0.0 1.1 38.3 2022 4.6 4.9 7.3 4.7 0.0 0.0 0.0 0.0 0.0 0.0 1.1 13.6 10.5 12.0 0.0 1.1 36.2 2023 7.9 3.9 7.8 2.4 0.0 0.0 0.0 0.0 0.0 0.4 4.0 4.8 25.4 10.1 0.0 4.4 31.1 2024 10.5 3.7 19.0