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