Halley 12Z 300hPa temperature 1957 - - - -57.6 -60.7 -62.2 -63.3 -63.3 -62.9 -61.5 -55.7 -53.5 1958 -50.2 -49.6 -54.8 -57.1 -61.5 -61.6 -63.8 -65.3 -64.3 -61.6 -58.6 -55.6 1959 -52.4 -52.6 -55.0 -57.0 -58.7 -61.9 -64.2 -64.3 -64.5 -61.8 -61.4 -55.4 1960 -53.7 -53.5 -55.4 -58.7 -59.2 -61.8 -63.0 -63.7 -61.9 -61.3 -57.5 -54.5 1961 -51.5 -55.2 -56.3 -53.9 -59.2 -61.7 -62.8 -63.3 -61.5 -59.5 -57.4 -57.0 1962 -51.5 -54.4 -55.3 -56.8 -59.5 -61.2 -62.7 -62.1 -63.3 -60.4 -57.6 -55.4 1963 -52.8 -53.1 -54.0 -59.6 -60.6 -60.6 -63.6 -64.3 -63.2 -61.6 -57.5 -53.6 1964 -51.2 -53.0 -53.8 -57.5 -60.0 -62.4 -61.6 -65.0 -64.7 -61.0 -56.3 -52.5 1965 -51.2 -52.0 -54.7 -59.3 -59.1 -60.9 -62.6 -63.0 -63.7 -60.3 -58.0 -54.7 1966 -52.1 -50.8 -53.2 -55.8 -58.8 -61.3 -63.6 -65.2 -63.5 -61.7 -57.9 -55.0 1967 -52.0 -53.3 -55.1 -58.4 -59.3 -62.2 -63.1 -63.9 -63.7 -63.3 -60.1 -53.5 1968 -52.2 -53.0 -55.7 -56.8 -60.4 -63.8 -63.7 -65.7 -62.6 -60.5 -57.6 -53.5 1969 -53.3 -53.8 -56.2 -57.5 -61.4 -61.6 -63.4 -63.3 -62.6 -62.0 -58.5 -54.5 1970 -53.2 -53.2 -54.2 -56.8 -59.5 -61.8 -63.0 -63.7 -62.1 -61.1 -58.0 -55.1 1971 -52.6 -54.8 -54.8 -55.7 -59.2 -60.3 -64.1 -62.5 -62.9 -61.2 -58.2 -52.9 1972 -53.4 -52.3 -54.3 -58.0 -59.1 -62.2 -61.9 -62.7 -62.2 -60.5 -57.1 -54.4 1973 -52.9 -53.7 -55.0 -58.9 -60.5 -61.4 -60.7 -62.7 -62.7 -59.8 -55.5 -52.6 1974 -52.8 -52.1 -54.9 -57.3 -60.3 -59.6 -63.4 -63.3 -63.3 -60.9 -56.6 -52.6 1975 -53.0 -50.4 -55.0 -56.0 -59.8 -63.3 -64.3 - - - - -52.9 1976 -52.2 -51.1 -52.4 -56.3 -60.5 -60.4 -63.7 -65.0 -63.5 -61.6 -58.2 -52.6 1977 -50.5 -52.0 -54.9 -58.2 - -59.5 -62.8 -64.1 -65.2 -61.2 -58.2 -54.9 1978 -50.3 -50.6 -54.4 -54.9 -57.8 -61.3 -63.8 -64.1 -61.9 -60.0 -56.7 -53.4 1979 -51.6 -51.0 -52.4 -55.6 -58.9 -62.1 -63.6 -65.6 -62.5 -61.3 -57.8 -52.1 1980 -51.4 -50.4 -53.8 -57.2 -57.8 -60.4 -64.0 -63.1 -62.3 -60.4 -57.2 -52.2 1981 - -53.2 -51.1 -57.6 -60.0 -62.2 -62.7 - - - - - 1982 - - -54.7 -58.0 -56.9 -61.1 -63.3 -63.1 -62.9 -60.5 -57.8 -54.7 1983 -52.2 -53.4 -53.8 -54.5 -57.5 -61.3 -63.2 -62.8 -62.1 -61.0 -57.1 -53.2 1984 - -54.7 -52.2 -58.0 -57.6 -60.0 -62.3 -62.8 -62.4 -60.3 -57.1 -52.3 1985 -52.0 -52.9 -53.2 -56.1 -58.5 -60.7 -62.7 -61.5 -60.6 -59.7 -58.5 -53.0 1986 -50.7 -50.1 -53.3 -55.2 -60.9 -62.1 -61.0 -64.2 -62.7 -60.8 -58.0 -55.8 1987 -52.2 -51.0 -54.5 -56.9 -58.0 -60.9 -62.4 -63.2 -62.9 -60.7 -59.0 -53.3 1988 -51.9 -53.0 -53.3 -57.3 -59.8 -61.8 -63.0 -61.7 -61.0 -59.1 -57.3 -51.7 1989 -49.3 -51.4 -54.4 -57.1 -60.0 -61.3 -61.7 -62.1 -62.1 -61.2 -57.8 -55.3 1990 -52.5 -53.4 -54.0 -56.3 -57.8 -61.1 -61.9 -63.5 -61.8 -59.1 -57.5 -55.1 1991 -51.5 -51.6 -56.1 -55.0 -60.5 -61.7 -62.1 -62.4 -59.8 -60.8 -57.9 -52.4 1992 - -54.0 -53.2 -56.1 -60.2 -62.2 -61.7 -64.3 -62.5 -59.9 -57.7 -52.9 1993 -52.5 -52.9 -54.8 -58.3 -60.3 -61.7 -63.2 -63.0 -62.7 -61.3 -56.9 -55.4 1994 -52.9 -52.5 -54.0 -55.4 -61.1 -61.3 -64.0 -63.6 -62.6 -63.1 -57.2 -50.2 1995 -51.5 -51.6 -54.9 -57.9 -59.8 -61.6 -63.9 -63.4 -63.6 -59.9 -58.6 -54.3 1996 -51.9 -50.9 -54.0 -55.7 -60.5 -62.2 -62.8 -60.9 -62.1 -60.4 -57.7 -54.7 1997 -52.0 -53.9 -52.8 -56.7 -59.7 -61.3 -63.1 -63.6 -63.6 -61.6 -58.5 -53.6 1998 -50.7 -50.0 -54.7 -57.0 -57.4 -60.0 -63.2 -63.4 -61.7 -60.9 -58.1 -55.6 1999 -50.9 -52.0 -53.5 -57.5 -58.4 -61.4 -61.3 -62.1 -61.5 -59.1 -56.9 -55.1 2000 -55.0 -51.6 -52.4 -57.6 -59.8 -60.0 -61.1 -63.6 -62.8 -61.3 -57.0 -54.6 2001 -52.0 -51.8 -54.3 -57.3 -59.3 -62.6 -63.0 -64.2 -61.5 -61.5 -58.7 -56.0 2002 -51.6 -53.4 -56.0 -56.6 -60.6 -62.6 -61.9 -62.5 -60.3 -60.6 -54.0 -52.6 2003 -52.1 -52.7 -54.4 -56.7 -60.4 -62.3 -62.5 -62.7 -62.5 -61.1 -58.8 -54.7 2004 -51.7 -54.1 -54.0 -55.5 -59.6 -62.2 -63.5 -65.4 -61.5 -58.9 -59.3 -55.0 2005 -50.3 -52.8 -55.0 -56.3 -59.4 -63.0 -62.9 -63.2 -62.3 -60.2 -58.5 -54.6 2006 -49.7 -52.3 -54.4 -56.9 -60.2 -59.6 -61.6 -63.0 -63.4 -60.4 -56.8 -55.5 2007 -52.0 -53.8 -55.7 -57.1 -58.1 -60.3 -62.7 -63.8 -62.8 -60.8 -57.7 -54.7 2008 -53.7 -53.2 -52.7 -56.0 -60.1 -62.3 -63.1 -63.7 -61.7 -61.6 -59.9 -57.0 2009 -53.9 -54.0 -53.3 -56.3 -59.7 -62.3 -60.5 -63.8 -63.1 -62.0 -58.6 -55.7 2010 -51.9 -52.4 -53.9 -58.6 -59.4 -61.9 -62.3 -63.2 -61.6 -60.8 -58.9 -55.3 2011 -52.1 -52.6 -54.7 -57.5 -58.8 -61.1 -61.6 -61.6 -62.7 -61.1 -57.2 -54.8 2012 -53.7 -52.2 -53.8 -56.3 -60.3 -61.9 -63.2 -63.6 -63.3 -61.8 -57.1 -52.5 2013 -51.8 -53.6 -53.6 -56.2 -60.4 -60.0 -62.4 -63.5 -60.9 -60.1 -57.4 -53.1 2014 -53.9 -52.6 -55.3 -55.8 -58.1 -60.9 -62.4 - - -60.9 -60.1 -54.3 2015 -53.4 -51.9 -53.8 -56.9 -59.4 -62.3 -63.8 -63.3 -64.4 -60.4 -59.4 -54.8 2016 -53.2 -51.9 -53.3 -57.5 -59.4 -62.0 -62.9 -61.7 -62.8 -60.6 -55.5 -52.3 2017 -53.6 -53.2 - - - - - - - - - -51.2 2018 -52.9 -51.4 - - - - - - - - - -52.7 2019 -52.1 -54.0 - - - - - - - - - -52.8 2020 -53.5 - - - - - - - - - - - 2021 - - - - - - - - - - - -55.6 2022 -52.8 - - - - - - - - - - -54.8 2023 -53.4 - - - - - - - - - - -53.9 2024 -53.0 - - - - - - - - - - -