Wales 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 28.4 1963 25.3 1963 20.5 1962 8.5 1968 5.1 1996 0.6 1991 0.1 1971 0.1 1976 1.5 1986 5.5 1993 11.3 1965 23.1 2010 69.5 1963 28.8 2013 0.6 1991 15.4 1993 89.3 2010 24.0 1979 25.0 1986 19.2 2013 8.3 2013 4.6 1979 0.4 1962 0.0 2018 0.1 1971 0.7 1979 4.9 2003 10.8 2005 19.4 1981 56.6 1979 25.0 1962 0.4 1973 12.4 1988 81.2 1963 23.5 1985 20.0 1968 15.7 1969 8.1 1970 3.1 1982 0.3 1989 0.0 2017 0.1 1964 0.7 1972 4.2 1997 10.2 1988 16.7 1961 47.5 2010 23.9 1969 0.4 1962 12.3 2010 79.6 1979 19.4 1987 19.7 1979 14.7 1970 7.8 1986 2.5 1984 0.3 1975 0.0 2016 0.0 2018 0.5 2018 3.6 1992 10.0 1985 16.0 1976 45.4 1991 22.9 1970 0.3 2011 11.9 1965 76.7 1969 18.9 2010 19.1 1991 13.4 1987 7.1 1989 2.4 2019 0.3 1973 0.0 2015 0.0 2017 0.5 1974 3.5 2018 9.7 1993 15.7 1996 44.3 1996 21.0 1979 0.3 1989 11.0 2005 73.4 1996 18.0 1980 18.7 1969 12.5 1976 7.1 1978 2.3 2010 0.3 1969 0.0 2014 0.0 2016 0.5 1969 2.8 1983 9.4 2010 15.7 1995 43.9 1986 19.6 2010 0.3 1977 10.8 1985 69.6 1985 17.3 1997 18.5 1996 12.3 2010 7.0 1969 2.3 1968 0.2 2011 0.0 2013 0.0 2015 0.4 1987 2.7 2010 9.4 1996 15.7 1969 43.3 1985 19.4 1996 0.3 1975 10.2 1971 67.3 1968 15.2 2011 18.2 1983 12.3 1964 6.8 1975 2.2 1977 0.2 1985 0.0 2012 0.0 2014 0.4 1975 2.4 1964 9.4 1969 15.7 1962 42.2 1965 19.2 1968 0.3 1971 10.1 1969 66.3 1962 15.2 1977 16.2 1981 12.0 1965 6.7 1984 2.1 1995 0.2 1977 0.0 2011 0.0 2013 0.3 2007 2.3 1981 9.2 1971 15.3 2008 42.0 2011 18.6 1975 0.3 1969 9.8 1996 65.4 2013 15.1 1991 15.4 2010 11.7 1985 6.4 1990 2.0 1975 0.2 1971 0.0 2010 0.0 2012 0.3 2003 2.2 1973 7.9 1967 14.8 1963 41.2 2009 17.2 1984 0.2 1985 9.6 1972 65.3 1965 14.8 2009 15.0 1978 11.5 2006 5.8 2008 1.9 1971 0.2 1967 0.0 2009 0.0 2011 0.2 2010 2.1 1988 7.6 1977 14.3 2001 40.9 1970 17.1 1976 0.2 1972 9.1 1983 64.5 1986 14.5 2013 14.4 1970 11.2 1979 5.5 1973 1.9 1967 0.1 2008 0.0 2008 0.0 2010 0.2 1996 2.0 2008 7.5 1980 13.8 1964 40.8 1982 17.1 1965 0.2 1967 9.0 1980 64.1 1970 14.5 1966 14.4 1965 10.9 1995 5.4 1983 1.4 2005 0.1 2007 0.0 2007 0.0 2009 0.2 1993 1.8 2002 7.4 1972 13.2 2009 39.8 1968 16.7 1995 0.2 1961 9.0 1973 62.4 1987 14.2 1992 14.3 2018 10.7 2018 5.3 1979 1.4 1997 0.1 2001 0.0 2006 0.0 2008 0.2 1990 1.8 1974 6.8 1973 13.1 1968 39.7 1987 16.5 1986 0.1 2018 8.5 1967 61.0 2001 14.0 1965 13.9 1987 9.9 2011 5.3 1977 1.4 1993 0.1 1999 0.0 2005 0.0 2007 0.2 1977 1.7 1987 6.8 1962 12.9 1978 39.7 1969 16.1 2001 0.1 2014 8.3 2003 59.1 1981 13.1 2001 13.5 2001 9.9 2001 5.3 1966 1.4 1980 0.1 1996 0.0 2004 0.0 2006 0.2 1971 1.7 1975 6.3 1983 12.3 1970 37.3 1997 16.1 1973 0.1 2013 8.2 1962 58.8 1964 12.6 1982 13.4 1985 9.8 1975 5.2 2016 1.4 1974 0.1 1993 0.0 2003 0.0 2005 0.2 1964 1.6 1966 6.1 2016 11.7 1992 37.2 2013 15.8 1987 0.1 2009 7.9 1977 57.1 1976 12.2 1986 13.3 2013 9.6 1973 5.2 2001 1.3 2013 0.1 1987 0.0 2002 0.0 2004 0.1 2015 1.5 2012 5.6 1966 11.3 1990 37.2 1977 15.7 1964 0.1 2008 7.3 1966 56.1 1991 11.7 1961 12.4 2003 9.4 1980 5.1 2010 1.2 1987 0.1 1986 0.0 2001 0.0 2003 0.1 2012 1.5 1972 5.3 2017 10.3 2007 36.9 1964 15.6 2006 0.1 2007 7.2 1964 56.1 1978 11.6 1984 12.4 1994 9.3 1996 5.1 1981 1.2 1969 0.1 1984 0.0 2000 0.0 2002 0.1 2005 1.4 1980 5.2 1990 10.3 1982 34.2 2001 15.1 1974 0.1 2004 7.0 1975 54.0 1980 11.4 2006 11.9 1984 8.9 1974 5.0 2000 1.1 2001 0.1 1983 0.0 1999 0.0 2001 0.1 1999 1.3 1994 5.2 1968 10.3 1967 33.6 1962 15.0 1971 0.1 2001 6.5 2018 53.7 1973 11.3 2019 11.6 2015 8.9 1971 4.9 2012 1.1 1994 0.1 1981 0.0 1998 0.0 2000 0.1 1995 1.3 1962 5.1 1989 9.6 2003 33.4 1981 14.9 1985 0.1 2000 6.5 2012 52.1 2003 11.2 2003 11.6 2004 8.6 1986 4.9 1998 1.1 1973 0.1 1979 0.0 1997 0.0 1999 0.1 1991 1.1 1998 5.1 1979 9.4 2012 32.8 1983 14.5 1980 0.1 1999 6.3 2016 49.9 1995 11.1 1964 11.5 2005 8.5 1968 4.9 1996 1.1 1965 0.1 1978 0.0 1996 0.0 1998 0.1 1988 1.0 1970 4.9 2012 9.1 1973 30.9 2006 13.3 1978 0.1 1996 6.3 1979 49.9 1984 10.9 1970 11.2 1976 8.2 2004 4.7 1974 1.0 1981 0.1 1976 0.0 1995 0.0 1997 0.1 1984 0.9 1999 4.9 1978 8.7 1998 30.9 1980 13.2 2018 0.1 1993 6.0 2007 49.4 1982 10.3 2017 11.1 2012 8.1 1984 4.3 1994 1.0 1962 0.1 1974 0.0 1994 0.0 1996 0.1 1983 0.8 2009 4.9 1975 8.6 2005 29.8 2018 13.1 2016 0.1 1988 5.9 1997 49.3 2009 10.1 1996 11.0 2009 7.6 2016 4.3 1976 0.9 2012 0.1 1972 0.0 1993 0.0 1995 0.1 1982 0.8 2007 4.8 2007 8.5 1989 29.8 2015 12.6 1982 0.1 1987 5.8 2017 47.3 2006 9.9 2000 10.9 1964 7.6 2005 4.2 1988 0.9 1961 0.1 1968 0.0 1992 0.0 1994 0.1 1976 0.8 1986 4.7 2013 8.5 1979 29.4 2004 12.1 1989 0.1 1986 5.8 2008 47.0 2008 9.9 1998 10.8 2006 7.4 2015 4.1 1971 0.8 1991 0.1 1966 0.0 1991 0.0 1993 0.1 1973 0.8 1985 4.7 1964 8.4 2017 29.3 2003 11.6 2008 0.1 1984 5.7 1992 46.9 1983 9.8 2015 10.1 2008 7.3 1972 4.0 2002 0.7 1963 0.1 1965 0.0 1990 0.0 1992 0.1 1970 0.8 1971 4.6 1995 8.4 2014 29.3 1966 11.4 2005 0.1 1983 5.5 1998 46.6 2005 9.7 1973 9.5 1962 7.2 1963 4.0 1965 0.6 2018 0.1 1964 0.0 1989 0.0 1991 0.1 1967 0.7 1984 4.4 1998 8.0 1980 29.0 1984 11.0 1977 0.1 1982 5.5 1990 45.8 1971 9.6 1978 9.4 1973 6.6 2003 3.9 1991 0.6 2007 0.1 1961 0.0 1988 0.0 1990 0.1 1966 0.7 1982 4.4 1976 7.9 1987 28.0 1978 11.0 1966 0.1 1981 5.4 1968 45.3 1967 9.5 1968 9.3 2016 6.6 1993 3.9 1982 0.6 1985 0.0 2018 0.0 1987 0.0 1989 0.1 1965 0.6 1991 4.2 2006 7.7 1965 27.9 1971 10.6 2003 0.1 1980 5.3 1987 45.0 1966 9.3 1995 8.8 1982 6.3 2009 3.8 2006 0.6 1978 0.0 2017 0.0 1986 0.0 1988 0.1 1963 0.6 1976 4.2 1991 7.6 2000 27.0 1992 10.4 2011 0.1 1979 5.3 1978 43.8 1977 9.2 1981 8.5 1971 5.7 2008 3.8 1999 0.6 1966 0.0 2016 0.0 1985 0.0 1987 0.1 1962 0.6 1961 4.2 1982 7.6 1991 26.3 2002 10.3 2000 0.1 1978 5.2 1989 43.3 2018 9.1 1972 8.1 1967 5.7 1978 3.7 1995 0.5 2017 0.0 2015 0.0 1984 0.0 1986 0.1 1961 0.5 2017 3.9 2001 7.4 1997 26.0 1994 10.1 2015 0.1 1976 5.1 1976 43.3 2012 9.0 1967 7.8 1988 5.6 1982 3.7 1980 0.5 2004 0.0 2014 0.0 1983 0.0 1985 0.0 2017 0.5 2015 3.8 2008 6.8 1993 25.3 1976 10.0 1990 0.1 1974 5.0 1982 43.1 1997 8.3 2004 7.0 1966 5.1 1966 3.6 2003 0.5 2003 0.0 2013 0.0 1982 0.0 1984 0.0 2016 0.5 2000 3.5 1961 6.7 1985 24.5 2008 9.8 1963 0.1 1970 4.9 2013 42.6 1975 8.0 1969 6.9 2007 5.0 2002 3.6 1997 0.5 1988 0.0 2012 0.0 1981 0.0 1983 0.0 2014 0.5 1979 3.3 2004 6.5 1999 23.5 1973 9.7 1983 0.1 1968 4.9 1995 41.8 1993 7.8 2012 6.7 2019 5.0 2000 3.4 1962 0.5 1972 0.0 2010 0.0 1980 0.0 1982 0.0 2013 0.5 1967 3.2 1987 6.5 1975 23.0 2012 9.6 2004 0.1 1966 4.8 1991 41.2 1992 7.6 1976 6.5 1975 4.8 1988 3.2 1964 0.4 1989 0.0 2009 0.0 1979 0.0 1981 0.0 2011 0.5 1965 3.0 2003 6.4 1986 22.2 2017 9.6 1981 0.1 1965 4.6 1974 41.0 1961 7.5 1962 6.2 1989 4.6 1989 3.1 1967 0.4 1983 0.0 2006 0.0 1978 0.0 1980 0.0 2009 0.4 2011 2.9 1999 6.4 1984 22.1 1967 9.5 1988 0.1 1964 4.5 1981 40.8 2016 7.1 2018 6.0 2017 4.4 1961 2.7 2019 0.3 2016 0.0 2005 0.0 1977 0.0 1979 0.0 2008 0.4 1978 2.7 1963 5.9 2016 21.8 1999 9.4 1993 0.0 2017 4.4 1986 38.8 2004 7.1 1971 6.0 1999 4.3 2014 2.7 2017 0.3 2006 0.0 2004 0.0 1976 0.0 1978 0.0 2006 0.3 2014 2.6 1970 5.9 2004 21.8 1993 9.3 2002 0.0 2016 4.3 2006 38.4 1972 7.0 1999 6.0 1977 4.2 2007 2.6 2015 0.3 2002 0.0 2003 0.0 1975 0.0 1977 0.0 2004 0.3 1969 2.5 2018 5.7 2002 21.5 2005 9.3 1972 0.0 2015 4.2 1961 36.3 2017 6.9 2002 5.9 1974 4.2 1991 2.6 1985 0.3 2000 0.0 2002 0.0 1974 0.0 1975 0.0 2002 0.2 2016 2.3 2015 5.5 1983 21.5 2000 9.2 1967 0.0 2012 4.0 2001 36.3 1989 6.9 1994 5.7 1972 4.1 1967 2.5 2009 0.3 1976 0.0 2000 0.0 1973 0.0 1974 0.0 2001 0.2 1995 2.3 2014 5.1 2006 21.1 1998 8.9 2009 0.0 2010 3.8 1999 35.2 2000 6.0 2016 5.2 1992 3.9 1983 2.4 2005 0.2 2015 0.0 1998 0.0 1972 0.0 1973 0.0 2000 0.1 2013 2.3 1974 4.9 1966 20.6 1974 8.8 1991 0.0 2006 3.6 1970 35.1 2011 5.6 1974 5.1 2002 3.5 1981 2.1 1992 0.2 2011 0.0 1997 0.0 1970 0.0 1972 0.0 1998 0.1 2004 2.2 1981 4.8 1994 20.0 2019 8.4 2012 0.0 2005 3.4 2004 35.1 1988 5.0 1993 5.1 2000 3.5 1977 2.0 2018 0.2 1998 0.0 1995 0.0 1969 0.0 1970 0.0 1997 0.1 1996 2.1 1992 4.7 1971 19.4 1988 8.3 2019 0.0 2003 2.9 1963 35.0 2015 4.6 2007 5.1 1993 3.4 1990 1.9 1963 0.2 1992 0.0 1994 0.0 1968 0.0 1969 0.0 1994 0.1 1990 2.1 1986 4.5 1972 19.4 1972 8.1 1997 0.0 2002 2.8 2015 35.0 1998 4.3 1983 4.4 1997 3.3 2019 1.6 2007 0.2 1990 0.0 1992 0.0 1967 0.0 1968 0.0 1992 0.1 1989 2.0 1984 4.0 2011 17.2 1995 7.7 1994 0.0 1998 2.7 1984 34.3 2007 4.1 2008 4.4 1980 3.3 1999 1.5 1972 0.2 1964 0.0 1990 0.0 1966 0.0 1967 0.0 1989 0.1 1977 1.8 2000 3.8 2013 16.5 2007 7.2 1999 0.0 1997 2.6 2014 33.6 1994 4.1 2005 3.8 2011 3.1 1997 1.3 1993 0.1 2014 0.0 1988 0.0 1965 0.0 1966 0.0 1985 0.1 1968 1.6 1997 3.5 1977 15.9 2016 7.1 1998 0.0 1995 2.6 2002 33.1 1974 4.0 2014 3.8 1998 2.7 2017 1.3 1987 0.1 2009 0.0 1982 0.0 1964 0.0 1965 0.0 1981 0.1 1963 1.1 2011 2.0 2018 14.1 1990 6.5 2007 0.0 1994 2.3 2000 32.4 1990 4.0 1989 3.2 1995 2.6 2012 1.1 1961 0.1 2008 0.0 1980 0.0 1963 0.0 1963 0.0 1980 0.0 2006 0.8 2002 1.8 1974 12.0 1975 6.5 1961 0.0 1992 1.8 1994 30.7 1999 3.7 1988 2.2 2014 2.4 1994 0.9 2004 0.1 1999 0.0 1970 0.0 1962 0.0 1962 0.0 1978 0.0 2005 0.6 1994 1.7 1988 11.9 1989 5.8 2017 0.0 1990 1.5 2011 29.6 2002 3.7 1975 2.2 1990 2.1 1992 0.7 2014 0.1 1986 0.0 1963 0.0 1961 0.0 1961 0.0 1968 0.0 2001 0.5 2009 0.5 2015 10.1 2014 5.0 2014 0.0 1963 1.4 2009 22.3 2014 3.4 1990 1.7 1961 2.0 1998 0.3 2011 0.1 1970 4.4 1992