Halley 12Z 700hPa temperature 1957 - - - -21.7 -26.0 -27.6 -26.7 -28.0 -22.2 -22.0 -19.4 -17.2 1958 -17.9 -18.6 -21.3 -22.8 -27.2 -25.3 -26.2 -27.3 -24.8 -22.5 -20.4 -20.9 1959 -17.0 -19.0 -20.0 -24.0 -22.3 -23.7 -27.8 -26.1 -27.6 -23.7 -23.2 -17.3 1960 -18.4 -18.8 -21.2 -21.4 -23.1 -23.8 -24.0 -26.5 -23.3 -21.9 -22.6 -19.7 1961 -16.6 -17.9 -20.9 -24.2 -20.8 -25.2 -27.2 -26.3 -24.3 -21.4 -20.1 -19.2 1962 -17.5 -19.9 -20.6 -22.7 -22.9 -25.5 -26.4 -26.6 -24.1 -23.0 -21.6 -20.1 1963 -15.2 -20.9 -22.1 -24.9 -22.9 -24.7 -25.1 -22.9 -23.4 -24.1 -19.8 -18.6 1964 -14.4 -17.1 -21.6 -22.7 -28.1 -22.4 -23.4 -27.7 -26.0 -24.1 -19.9 -19.8 1965 -17.6 -19.0 -19.3 -22.9 -22.0 -26.4 -25.3 -24.9 -23.3 -22.8 -19.9 -17.8 1966 -17.8 -17.3 -19.8 -21.6 -22.5 -25.2 -27.3 -25.8 -24.6 -22.8 -20.2 -17.5 1967 -15.9 -20.1 -19.9 -22.4 -23.3 -23.4 -27.3 -24.8 -24.1 -23.6 -23.4 -17.4 1968 -19.1 -18.4 -18.9 -20.7 -23.1 -24.8 -25.5 -25.3 -28.6 -19.7 -19.0 -17.9 1969 -17.1 -19.1 -21.7 -20.8 -23.8 -26.5 -26.9 -25.6 -23.0 -23.6 -21.9 -14.7 1970 -17.9 -18.1 -20.7 -22.3 -23.2 -25.9 -24.2 -26.7 -21.2 -20.9 -19.6 -16.9 1971 -16.7 -20.2 -19.3 -17.6 -26.0 -24.9 -25.4 -23.6 -25.4 -23.2 -19.6 -18.1 1972 -18.2 -18.7 -22.0 -23.2 -21.5 -26.4 -24.8 -24.6 -24.3 -22.6 -20.2 -17.1 1973 -17.5 -19.9 -20.6 -22.9 -23.8 -25.2 -26.9 -24.9 -24.6 -20.6 -20.9 -19.6 1974 -18.0 -19.3 -19.2 -22.6 -23.8 -23.9 -27.1 -24.3 -24.2 -22.5 -21.1 -18.9 1975 -16.2 -17.5 -19.7 -24.6 -24.3 -25.7 -26.3 - - - - -17.0 1976 -16.1 -18.9 -19.4 -20.9 -24.6 -23.5 -25.8 -26.2 -25.2 -24.9 -19.5 -15.7 1977 -17.5 -19.4 -20.0 -18.7 - -22.5 -25.9 -24.2 -26.1 -23.0 -19.3 -21.2 1978 -18.6 -21.6 -19.3 -18.0 -20.6 -24.1 -26.0 -25.5 -25.5 -21.0 -20.7 -19.4 1979 -16.0 -20.0 -18.8 -20.2 -24.6 -24.5 -27.2 -25.4 -23.1 -22.9 -20.4 -17.1 1980 -17.3 -18.6 -20.8 -22.5 -24.8 -24.5 -26.3 -26.5 -22.9 -22.3 -21.2 -18.6 1981 - -17.7 -19.6 -20.9 -22.4 -25.3 -24.6 - - - - - 1982 - - -20.9 -22.2 -22.4 -20.7 -27.1 -26.8 -23.5 -20.8 -19.8 -16.1 1983 -17.8 -17.7 -21.6 -21.0 -19.5 -24.1 -24.7 -23.2 -24.6 -23.3 -20.9 -17.7 1984 - -17.0 -19.8 -20.9 -20.9 -27.0 -23.5 -22.8 -22.3 -23.3 -20.9 -14.4 1985 -15.9 -18.1 -18.4 -22.3 -24.2 -24.3 -23.5 -22.3 -23.0 -21.8 -21.7 -17.2 1986 -15.3 -15.0 -17.9 -19.9 -26.0 -24.1 -23.1 -26.0 -26.7 -23.4 -19.6 -16.1 1987 -16.7 -14.0 -20.1 -21.1 -23.5 -23.6 -25.1 -27.4 -24.5 -23.0 -19.2 -16.5 1988 -15.9 -18.6 -19.0 -21.0 -21.6 -23.8 -25.1 -21.6 -19.8 -21.3 -18.8 -17.1 1989 -16.0 -17.7 -17.4 -24.5 -23.0 -22.0 -21.8 -22.4 -22.5 -21.5 -18.8 -19.2 1990 -15.0 -18.5 -18.9 -21.0 -22.6 -22.2 -23.8 -24.9 -22.5 -21.2 -18.5 -18.1 1991 -15.3 -15.1 -20.6 -19.7 -23.5 -23.8 -25.4 -23.8 -21.3 -21.8 -19.6 -14.3 1992 - -18.5 -23.4 -20.0 -22.1 -24.9 -25.6 -27.6 -23.2 -19.0 -20.3 -15.2 1993 -16.6 -18.5 -20.1 -22.6 -22.6 -25.9 -23.7 -23.9 -25.7 -23.2 -17.6 -17.2 1994 -16.1 -19.5 -19.3 -22.2 -22.5 -23.7 -26.8 -25.9 -21.6 -25.9 -18.8 -19.5 1995 -16.3 -19.2 -18.4 -22.7 -22.8 -22.6 -26.7 -27.4 -24.0 -20.2 -20.8 -17.5 1996 -17.4 -15.5 -19.1 -21.3 -22.4 -23.9 -25.7 -21.1 -24.9 -21.0 -19.0 -16.7 1997 -14.6 -18.6 -19.7 -21.4 -23.5 -25.1 -26.9 -25.2 -26.8 -25.9 -20.7 -16.8 1998 -15.5 -16.1 -18.8 -22.6 -24.2 -20.9 -22.7 -23.3 -23.5 -22.9 -18.4 -16.5 1999 -15.9 -17.2 -19.1 -22.5 -19.8 -21.8 -24.3 -25.4 -24.5 -18.9 -17.8 -18.6 2000 -18.6 -18.8 -18.6 -22.3 -21.7 -23.0 -23.0 -25.6 -25.6 -22.1 -19.9 -20.0 2001 -17.7 -18.5 -22.3 -23.5 -19.4 -25.2 -25.8 -25.7 -20.8 -24.2 -19.6 -17.5 2002 -16.7 -17.8 -18.6 -19.6 -24.3 -25.5 -25.1 -22.3 -22.7 -22.4 -23.2 -16.7 2003 -15.4 -15.9 -20.4 -22.0 -22.9 -25.0 -26.6 -22.7 -21.9 -21.2 -21.3 -17.4 2004 -16.5 -19.8 -18.7 -21.6 -23.9 -23.2 -25.3 -27.1 -19.8 -20.3 -20.2 -17.2 2005 -16.2 -17.3 -18.2 -20.2 -24.2 -25.1 -26.4 -23.1 -22.4 -20.3 -20.4 -17.9 2006 -17.4 -20.7 -15.9 -21.2 -23.9 -22.9 -23.8 -26.7 -25.5 -21.4 -19.0 -18.1 2007 -14.5 -19.4 -19.9 -24.6 -21.7 -23.6 -25.4 -24.1 -22.7 -22.8 -21.3 -17.2 2008 -17.9 -19.5 -20.6 -19.6 -23.2 -25.6 -23.3 -25.8 -19.5 -23.9 -21.1 -19.7 2009 -18.1 -18.8 -18.1 -23.0 -22.4 -23.1 -25.4 -25.1 -24.6 -22.5 -20.4 -17.6 2010 -14.8 -17.6 -20.1 -22.6 -20.5 -20.8 -23.1 -22.3 -20.6 -19.7 -19.4 -17.0 2011 -15.4 -16.8 -19.6 -20.7 -22.6 -24.1 -25.2 -24.4 -24.7 -24.6 -20.6 -20.1 2012 -18.8 -17.3 -19.0 -21.5 -22.0 -24.2 -24.2 -24.5 -23.5 -21.6 -19.3 -15.3 2013 -15.4 -18.6 -20.2 -20.7 -23.9 -21.5 -23.5 -22.5 -21.3 -23.3 -20.0 -16.7 2014 -18.2 -19.1 -20.3 -19.0 -19.9 -23.6 -24.5 - - -22.4 -22.1 -18.3 2015 -18.8 -17.2 -20.1 -20.3 -21.5 -25.5 -24.5 -26.2 -26.4 -22.9 -20.5 -16.7 2016 -16.9 -16.8 -20.3 -20.7 -23.3 -22.7 -24.6 -25.0 -23.7 -21.8 -19.3 -18.9 2017 -16.3 -17.4 - - - - - - - - - -16.7 2018 -18.3 -20.5 - - - - - - - - - -16.3 2019 -18.2 -19.5 - - - - - - - - - -14.7 2020 -15.5 - - - - - - - - - - - 2021 - - - - - - - - - - - -18.2 2022 -14.3 - - - - - - - - - - -18.2 2023 -16.5 - - - - - - - - - - -18.1 2024 -16.4 - - - - - - - - - - -