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