Northern_Ireland Days of Air Frost Areal series, starting from 1961 Allowances have been made for topographic, coastal and urban effects where relationships are found to exist. Seasons: Winter=Dec-Feb, Spring=Mar-May, Summer=June-Aug, Autumn=Sept-Nov. (Winter: Year refers to Jan/Feb). Values are ranked and displayed to 1 dp. Where values are equal, rankings are based in order of year descending. Data are provisional from January 2018 and Winter 2018. Last updated 04/06/2019. JAN Year FEB Year MAR Year APR Year MAY Year JUN Year JUL Year AUG Year SEP Year OCT Year NOV Year DEC Year WIN Year SPR Year SUM Year AUT Year ANN Year 25.3 1963 22.0 1963 16.9 1962 10.1 1983 5.1 1979 0.4 1991 0.1 1971 0.1 2014 1.4 1986 5.5 1993 13.4 1985 22.5 2010 56.4 1963 23.1 1969 0.4 1991 14.4 1993 88.1 2010 24.0 1979 20.9 1968 14.8 2013 8.8 1986 4.2 1996 0.4 1975 0.0 2018 0.1 1982 0.9 1974 3.6 1992 13.3 1969 18.1 1961 49.6 1979 22.5 1962 0.4 1975 14.3 2010 79.6 1979 23.4 1985 19.9 1986 14.7 1969 8.3 1968 3.4 1984 0.4 1962 0.0 2017 0.1 1964 0.9 1972 2.9 2003 12.1 2010 17.1 1976 48.8 2010 22.4 1979 0.4 1962 13.8 1969 74.7 1963 16.9 1984 17.3 1969 12.9 1979 7.7 1970 3.2 1968 0.2 2015 0.0 2016 0.0 2018 0.6 1991 2.9 1981 11.6 1965 15.9 1981 44.1 2011 21.3 2013 0.2 2015 13.7 1985 74.5 1969 16.8 1980 17.2 1996 12.0 2010 7.7 1969 2.9 1982 0.2 1997 0.0 2015 0.0 2017 0.6 1975 2.5 2018 10.8 1996 15.8 2009 43.2 1977 19.6 1970 0.2 1997 12.1 1965 69.6 1985 16.3 2011 16.8 2010 11.9 1970 7.2 1989 2.7 1977 0.2 1989 0.0 2014 0.0 2016 0.5 1971 2.5 2002 8.8 1993 13.3 2008 42.5 1985 18.9 1968 0.2 1989 11.2 1996 64.7 1968 16.3 2010 16.8 1979 11.0 2018 6.1 2013 2.3 1973 0.1 2012 0.0 2013 0.0 2015 0.4 2018 2.5 1973 8.4 1977 13.0 1982 42.0 1991 18.2 2010 0.2 1964 10.1 1973 63.9 1986 16.1 1977 16.3 1970 10.9 1987 6.1 1978 2.0 1995 0.1 2011 0.0 2012 0.0 2013 0.4 2007 2.4 1988 7.5 2016 12.8 1995 40.2 1986 17.7 1984 0.1 2014 9.3 1988 59.8 1965 15.3 1987 16.2 1991 10.6 2001 5.8 2016 1.9 1967 0.1 2001 0.0 2011 0.0 2012 0.3 2012 2.3 1987 7.5 1973 12.3 1968 39.0 1969 17.6 1986 0.1 2012 9.1 1966 59.3 1970 14.8 1991 13.6 1987 10.6 1980 5.7 2000 1.8 1975 0.1 1999 0.0 2010 0.0 2011 0.3 1984 2.1 2010 7.5 1966 11.6 1996 37.9 1970 16.9 1975 0.1 2011 8.8 1977 58.0 1996 14.7 1965 13.3 2018 10.4 1985 5.4 1998 1.5 2012 0.1 1998 0.0 2009 0.0 2010 0.3 1977 1.8 2012 6.9 1988 11.6 1963 37.6 1968 15.9 1973 0.1 2001 8.7 1971 57.8 1984 13.4 1986 13.2 1978 10.3 2006 5.2 1966 1.4 2019 0.1 1987 0.0 2008 0.0 2009 0.2 2010 1.8 1984 6.9 1972 11.0 2001 37.1 1965 15.5 2018 0.1 1999 8.3 1984 53.6 1987 12.9 1966 12.6 2001 10.2 1975 5.1 1962 1.4 1997 0.1 1984 0.0 2007 0.0 2008 0.2 1993 1.8 1983 6.9 1971 11.0 1990 36.4 1987 15.1 1995 0.1 1998 8.2 1972 53.5 1980 12.7 1978 12.6 1983 9.8 1995 5.0 1973 1.4 1993 0.1 1972 0.0 2006 0.0 2007 0.2 1990 1.6 2008 6.4 1990 10.9 1969 36.1 2009 14.5 1983 0.1 1987 8.0 2016 52.8 1962 12.6 1982 12.5 1985 9.6 1984 4.9 2010 1.3 2010 0.0 2018 0.0 2005 0.0 2006 0.2 1982 1.6 1966 6.3 1984 10.6 1964 36.1 1982 14.2 2006 0.1 1985 8.0 2012 51.8 2001 12.5 2009 11.8 2004 9.1 1972 4.9 1975 1.3 1965 0.0 2017 0.0 2004 0.0 2005 0.2 1979 1.4 1971 6.1 1980 10.4 1989 35.1 1980 14.2 2001 0.1 1984 7.2 1983 51.8 1978 12.5 2001 11.8 1965 8.8 1986 4.8 2012 1.2 1981 0.0 2016 0.0 2003 0.0 2004 0.2 1969 1.3 2015 6.0 2005 10.1 1979 35.0 2001 14.1 1989 0.1 1982 7.0 1980 49.9 1973 11.8 1995 10.3 2009 8.7 1965 4.8 1984 0.8 2015 0.0 2014 0.0 2002 0.0 2003 0.1 2017 1.3 2004 5.9 2012 9.9 2000 34.8 1996 13.5 1980 0.1 1977 7.0 1974 49.7 1982 11.3 2015 10.3 1973 8.6 1973 4.7 1977 0.8 1994 0.0 2013 0.0 2001 0.0 2002 0.1 2015 1.3 1997 5.7 1976 9.8 1992 34.2 1962 13.3 1996 0.1 1972 6.8 1976 48.4 2009 11.3 1972 10.0 1994 8.4 2011 4.4 1999 0.8 1985 0.0 2010 0.0 2000 0.0 2001 0.1 2014 1.3 1964 5.7 1974 9.3 1965 30.7 1983 13.2 1974 0.1 1971 6.6 1990 48.4 1976 11.0 1997 9.9 2016 8.3 1974 4.4 1979 0.7 2005 0.0 2009 0.0 1999 0.0 2000 0.1 2013 1.0 1976 5.6 1979 9.0 2017 30.6 2018 13.2 1971 0.1 1969 6.3 1992 47.7 1977 10.8 2003 9.9 2013 8.3 1971 4.4 1974 0.7 1991 0.0 2008 0.0 1998 0.0 1999 0.1 2009 1.0 1975 5.3 1983 9.0 1962 28.9 1978 13.0 1985 0.1 1966 6.3 1979 47.4 1991 10.7 1970 9.9 1981 8.0 2015 4.3 1971 0.7 1983 0.0 2007 0.0 1997 0.0 1998 0.1 2006 0.9 1980 5.3 1963 8.9 2012 28.6 1984 12.9 1987 0.0 2018 6.2 2005 47.2 2013 9.7 1962 9.9 1977 7.6 1964 4.1 1981 0.7 1969 0.0 2006 0.0 1996 0.0 1997 0.1 2005 0.7 2014 5.1 1967 8.8 1978 27.8 1997 12.8 1978 0.0 2017 6.2 1964 47.1 1981 9.4 1969 9.5 2006 7.6 1963 3.9 2015 0.6 2018 0.0 2005 0.0 1995 0.0 1996 0.1 2003 0.7 1998 4.9 1991 8.7 1967 27.7 1966 12.6 2015 0.0 2016 5.7 1991 47.1 1972 9.3 1998 9.2 2003 7.5 1976 3.9 1996 0.6 2007 0.0 2004 0.0 1994 0.0 1995 0.1 2002 0.6 2009 4.9 1964 8.6 1972 27.2 2015 11.9 1965 0.0 2013 5.6 1975 46.5 1995 8.4 1988 8.8 1964 7.4 1968 3.8 2018 0.6 2001 0.0 2003 0.0 1993 0.0 1994 0.1 2001 0.6 2007 4.8 1970 8.3 2003 26.9 2013 11.5 1972 0.0 2010 5.5 2008 44.8 2018 8.4 1961 8.6 2015 6.9 2003 3.8 2008 0.6 1988 0.0 2002 0.0 1992 0.0 1993 0.1 1996 0.5 2013 4.5 1982 8.0 1980 26.5 2004 11.3 1982 0.0 2009 5.5 1967 42.9 2003 8.3 2018 8.2 1988 6.4 1989 3.5 2002 0.6 1971 0.0 2000 0.0 1991 0.0 1992 0.1 1995 0.5 2000 4.5 1968 7.7 1993 25.9 1994 11.0 1976 0.0 2008 5.4 1963 42.9 1983 8.3 1971 8.2 1980 6.3 2014 3.5 1967 0.5 2006 0.0 1996 0.0 1990 0.0 1991 0.1 1988 0.5 1994 4.4 1962 7.7 1970 25.5 2003 10.6 2016 0.0 2007 5.3 1987 41.8 1971 8.2 1994 8.1 1984 6.3 1993 3.4 1994 0.5 2000 0.0 1995 0.0 1989 0.0 1990 0.1 1987 0.5 1982 4.3 2013 7.5 1999 25.2 1973 10.2 1963 0.0 2006 5.3 1986 41.5 1966 8.0 2017 7.9 2008 6.1 1978 3.4 1988 0.5 1992 0.0 1994 0.0 1988 0.0 1989 0.1 1983 0.5 1979 4.3 1989 7.5 1986 25.1 1964 9.8 1977 0.0 2005 5.2 2018 41.1 2008 8.0 2013 7.9 2007 5.6 1982 3.4 1976 0.5 1989 0.0 1993 0.0 1987 0.0 1988 0.1 1976 0.5 1974 4.2 1978 7.4 2014 25.0 1981 9.6 2003 0.0 2004 5.2 1981 39.9 1964 8.0 1968 7.6 1982 5.5 2002 3.3 2006 0.5 1980 0.0 1992 0.0 1986 0.0 1987 0.1 1963 0.4 2016 4.2 1961 7.3 1973 23.2 1972 9.5 2000 0.0 2003 5.1 2003 39.7 1975 7.5 1992 7.3 1972 5.4 2004 3.3 1995 0.5 1978 0.0 1990 0.0 1985 0.0 1986 0.0 2016 0.4 1972 4.0 1975 6.9 1998 23.1 1988 9.5 1964 0.0 2002 5.1 1982 39.0 1993 7.4 1999 7.1 1989 5.2 1996 3.0 2001 0.5 1974 0.0 1988 0.0 1984 0.0 1985 0.0 2011 0.4 1967 3.9 2008 6.8 1985 23.0 2006 9.4 2002 0.0 2000 5.0 1970 38.8 2016 7.4 1967 7.0 1976 5.1 2005 2.9 1990 0.4 2017 0.0 1986 0.0 1983 0.0 1984 0.0 2008 0.4 1965 3.7 2000 6.5 2005 22.8 1971 9.3 1967 0.0 1996 4.8 2013 38.7 1989 7.1 2016 6.9 1971 5.0 2009 2.8 1982 0.4 2016 0.0 1985 0.0 1982 0.0 1983 0.0 2004 0.4 1962 3.6 1986 6.5 1984 20.9 1995 9.2 1999 0.0 1995 4.8 1962 38.4 1961 7.1 2006 6.7 2005 4.9 2007 2.7 1961 0.4 2013 0.0 1983 0.0 1981 0.0 1981 0.0 2000 0.3 2017 3.4 2017 6.4 1987 19.9 1999 9.0 2012 0.0 1994 4.6 1997 38.0 2015 7.1 1981 6.6 2017 4.8 2017 2.5 1963 0.4 2002 0.0 1982 0.0 1980 0.0 1980 0.0 1999 0.3 1996 3.3 1998 5.6 2004 19.7 2016 8.9 2011 0.0 1993 4.6 1968 37.1 2006 7.0 2019 6.5 1992 4.6 1999 2.4 2003 0.4 1987 0.0 1981 0.0 1979 0.0 1979 0.0 1998 0.3 1991 3.2 2009 5.5 2002 19.2 1974 8.9 1981 0.0 1992 4.3 1989 37.0 2011 6.4 2004 6.5 1962 4.5 2008 2.3 1980 0.4 1962 0.0 1980 0.0 1978 0.0 1978 0.0 1997 0.3 1986 3.2 1997 5.4 1994 18.7 1990 8.5 2008 0.0 1990 4.3 1978 36.8 1967 6.4 1976 6.3 1974 4.4 1997 2.2 1972 0.4 1961 0.0 1979 0.0 1977 0.0 1977 0.0 1994 0.3 1985 2.9 1995 5.4 1966 18.6 1967 8.5 1993 0.0 1988 4.3 1961 34.0 2000 6.3 1975 5.8 1967 4.3 2016 2.0 1997 0.3 2009 0.0 1978 0.0 1976 0.0 1976 0.0 1992 0.2 1999 2.8 1987 5.0 1975 18.4 2008 8.5 1966 0.0 1986 4.2 2000 34.0 1988 6.3 1973 5.6 1999 3.9 1991 1.9 1991 0.3 2004 0.0 1977 0.0 1975 0.0 1975 0.0 1989 0.2 1995 2.7 1992 4.7 2011 18.4 1976 7.7 1997 0.0 1983 4.1 1998 33.9 2012 6.2 2000 5.5 1966 3.9 1967 1.9 1965 0.2 2008 0.0 1976 0.0 1974 0.0 1974 0.0 1985 0.2 1969 2.3 2018 4.7 2007 18.3 1993 7.5 1998 0.0 1981 3.8 2009 33.8 2017 5.8 2008 5.4 1975 3.7 1983 1.8 1964 0.2 2003 0.0 1974 0.0 1973 0.0 1973 0.0 1981 0.1 2011 2.3 1981 4.6 1971 18.2 2002 7.5 1988 0.0 1980 3.7 2017 33.3 2004 5.6 1974 5.3 2011 3.6 1981 1.7 1985 0.2 1990 0.0 1973 0.0 1972 0.0 1972 0.0 1980 0.1 2005 2.2 2006 4.1 2006 17.8 2000 7.3 2014 0.0 1979 3.2 1995 33.3 1974 5.1 1983 5.2 1997 3.5 1988 1.5 2005 0.2 1976 0.0 1971 0.0 1970 0.0 1971 0.0 1978 0.1 2001 2.1 2003 3.8 1991 17.8 1992 7.2 2005 0.0 1978 3.1 2004 33.0 1992 4.9 2014 5.0 2019 3.2 2000 1.5 1987 0.2 1972 0.0 1970 0.0 1969 0.0 1970 0.0 1973 0.1 1978 1.9 2007 3.7 1997 17.7 2017 7.0 2007 0.0 1976 3.0 2002 32.4 1997 4.8 1996 4.8 2012 3.2 1966 1.4 2007 0.2 1963 0.0 1969 0.0 1968 0.0 1969 0.0 1970 0.1 1977 1.8 2004 3.5 1983 16.6 2007 6.5 1991 0.0 1974 2.8 2007 31.8 1999 4.8 1993 4.7 2014 2.6 2012 1.3 2019 0.1 2014 0.0 1968 0.0 1967 0.0 1968 0.0 1968 0.1 1970 1.8 1999 3.2 2013 16.4 2005 6.4 2017 0.0 1973 2.6 2015 31.0 1994 4.7 1964 4.5 1990 2.5 2019 1.2 2017 0.1 2011 0.0 1967 0.0 1966 0.0 1967 0.0 1967 0.1 1968 1.6 2014 3.1 2016 15.6 1998 6.4 2004 0.0 1970 2.3 2014 30.8 2005 4.6 2007 4.1 2000 2.4 1977 1.1 1992 0.1 1999 0.0 1966 0.0 1965 0.0 1966 0.0 1966 0.1 1963 1.5 2011 3.0 1977 14.4 2019 6.3 1994 0.0 1968 2.3 2006 30.8 1990 4.2 2005 3.9 2002 2.3 1961 1.0 2014 0.1 1998 0.0 1965 0.0 1964 0.0 1965 0.0 1965 0.1 1961 1.3 2015 2.6 2015 12.8 1975 6.0 2009 0.0 1967 2.0 1999 30.4 1998 3.8 1990 3.6 1995 2.1 1994 0.8 1993 0.1 1986 0.0 1964 0.0 1963 0.0 1963 0.0 1964 0.0 2006 1.2 2001 2.4 2018 12.7 2014 5.4 1961 0.0 1965 1.6 2011 27.1 2007 3.3 2002 3.6 1993 2.0 1998 0.7 2009 0.1 1966 0.0 1963 0.0 1962 0.0 1962 0.0 1962 0.0 1990 0.6 1994 1.1 1974 12.6 2012 5.2 2019 0.0 1963 1.4 2001 26.7 2014 3.0 2012 2.5 1998 1.9 1990 0.7 2004 0.0 1970 0.0 1961 0.0 1961 0.0 1961 0.0 1961 0.0 1989 0.5 2002 0.5 1988 10.3 1989 4.9 1990 0.0 1961 1.0 1994 25.1 2002 2.7 1989 2.1 1961 1.3 1992 0.4 2011 0.0 1964 2.8 1992