Casey 00Z 300hPa temperature 1957 - - - -52.9 -56.9 -56.0 -60.5 -60.1 -61.5 -56.4 -49.8 -51.8 1958 -48.9 -50.7 -52.0 -55.5 -56.3 -58.3 -59.2 -61.6 -60.7 -59.0 -55.4 -53.4 1959 -51.6 -46.8 -49.2 -53.8 -55.8 -58.5 -61.1 -60.7 -61.2 -57.5 -55.4 -51.2 1960 -51.3 -51.1 -51.2 -53.4 -54.7 -59.6 -59.3 -60.8 -60.1 -59.0 -53.7 -51.5 1961 -51.7 -50.4 -50.8 -53.3 -57.6 -57.5 -61.2 -58.9 -59.8 -56.9 -53.6 -52.1 1962 -52.1 -51.3 -54.2 -53.8 -56.7 -59.5 -59.9 -61.0 -60.9 -57.6 -53.7 -52.8 1963 -49.7 -51.6 -50.8 -54.3 -53.3 -59.4 -60.7 -59.9 -61.1 -60.4 -56.2 -52.2 1964 -51.9 -53.3 -52.4 -53.0 -57.7 -57.5 -59.1 -59.2 -59.2 -55.9 -53.3 -50.2 1965 -49.5 -52.9 -53.4 -52.2 -54.9 -60.7 -62.3 -60.6 -62.7 -59.3 -56.4 -52.8 1966 -52.4 -49.0 -51.2 -55.4 -56.8 -58.4 -59.1 -62.4 -59.4 -57.9 -53.3 -51.9 1967 -51.0 -51.4 -52.9 -55.0 - -58.8 -59.0 -61.9 -61.1 -58.8 -54.6 -52.4 1968 -51.7 -52.2 -51.5 -53.0 -56.1 -58.7 -61.6 -62.0 -60.9 -58.1 -51.7 -50.7 1969 -50.9 -52.1 - -56.5 -56.8 -60.1 -62.0 -61.3 -60.2 -59.5 -55.3 -51.5 1970 -51.5 -53.7 -50.0 -52.2 -54.9 -56.0 -60.3 -61.2 -59.5 -58.6 -53.1 -50.8 1971 -51.8 -49.0 -52.4 -53.8 -55.5 -60.4 -60.6 -60.5 -59.8 -57.7 -54.1 -50.5 1972 -52.3 -50.7 -54.5 -56.8 -58.2 -60.4 -60.1 -60.0 -60.5 -57.0 -54.5 -54.0 1973 -51.8 -50.5 -52.4 -53.4 -55.9 -57.9 -60.3 -61.1 -59.5 -57.4 -53.8 -52.3 1974 -51.1 -50.3 -53.2 -54.3 -57.2 -58.2 -60.5 -61.1 -60.2 -57.2 -53.1 -52.0 1975 -50.2 -52.4 -49.9 -54.2 -57.5 -60.1 -59.0 -59.8 -60.0 -58.3 -54.5 -51.9 1976 -49.4 -51.3 -51.1 -53.0 -57.4 -59.0 -60.7 -60.9 -60.7 -58.9 -51.7 -52.0 1977 -51.6 -51.7 -54.5 -57.4 -56.0 -57.8 -59.9 -60.9 -61.5 -57.8 -54.3 -53.2 1978 -50.9 -50.6 -52.7 -55.1 -56.2 -58.3 -60.3 -61.9 -59.9 -59.0 -53.8 -50.2 1979 -52.5 -49.9 -54.4 -54.1 -57.3 -59.8 -59.5 -62.0 -60.4 -58.0 -53.6 -53.3 1980 -51.3 -50.7 -53.5 -53.9 -58.2 -58.1 -59.4 -59.2 -60.4 -58.9 -55.0 -52.7 1981 -51.7 -49.7 -51.7 -56.2 -57.8 -58.7 -59.6 -60.3 -59.6 -60.2 -54.7 -51.4 1982 -51.7 -50.2 -52.8 -54.6 -57.8 -58.9 -59.7 -62.9 -61.6 -59.3 -53.9 -50.5 1983 -51.8 -53.3 -51.8 -53.9 -56.8 -58.2 -60.6 -61.3 -60.4 -58.8 -56.3 -51.9 1984 -51.7 -51.4 -51.0 -54.7 -56.0 -59.5 -60.7 -60.8 -59.9 -59.1 -54.6 -51.8 1985 -50.2 -52.2 -54.3 -53.9 -56.1 -58.7 -61.3 -60.8 -61.7 -59.7 -55.4 -52.2 1986 -49.8 -49.9 -54.0 -55.6 -56.1 -57.7 -59.8 -62.7 -59.7 -58.3 -54.1 -49.7 1987 -49.3 -51.3 -51.0 -54.6 -57.2 -56.0 -60.0 -61.8 -60.8 -58.8 -55.6 -52.0 1988 -50.2 -53.3 -52.2 -55.1 -55.6 -58.0 -58.9 -58.6 -57.4 -56.6 -52.8 -51.2 1989 -50.9 -48.5 -50.6 -55.2 -58.1 -59.9 -59.9 -59.1 -59.2 -57.7 -55.0 -48.9 1990 -50.5 -49.0 -52.3 -52.5 -55.4 -57.4 -58.6 -61.4 -61.2 -57.1 -55.1 -50.4 1991 -50.2 -51.8 -51.0 -52.1 -55.1 -56.9 -57.3 -59.9 -60.5 -57.8 -54.4 -50.7 1992 -51.6 -51.3 -52.8 -54.4 -54.9 -55.9 -58.4 -60.3 -60.7 -59.0 -52.4 -53.0 1993 -52.1 -50.8 -52.5 -55.2 -57.5 -58.8 -59.6 -61.2 -60.2 -58.8 -53.6 -52.9 1994 -50.2 -51.7 -53.1 -55.4 -56.2 -55.3 -59.0 -60.5 -59.1 -56.8 -52.0 -52.1 1995 -51.5 -52.7 -52.4 -52.1 -56.2 -58.4 -57.6 -60.3 -60.7 -58.7 -54.2 -52.2 1996 -51.6 -52.2 -51.3 -53.4 -60.1 -56.5 -60.6 -59.2 -58.3 -58.0 -55.5 -50.9 1997 -50.0 -51.1 -52.4 -54.2 -56.4 -59.4 -61.2 -60.2 -61.2 -57.6 -54.3 -51.2 1998 -52.6 -51.3 -51.8 -55.3 -57.8 -56.7 -59.7 -59.9 -59.1 -58.6 -55.6 -54.0 1999 -53.2 -49.8 -54.3 -55.2 -56.3 -59.6 -60.3 -61.1 -59.9 -57.2 -55.2 -54.3 2000 -51.7 -51.6 -54.1 -54.3 -57.5 -56.8 -59.5 -60.6 -59.1 -58.5 -55.2 -52.7 2001 -49.3 -50.1 -51.8 -56.7 -56.4 -57.4 -60.8 -62.3 -61.3 -58.2 -56.8 -50.7 2002 -49.9 -49.1 -51.0 -55.4 -54.0 -57.5 -59.1 -59.7 -57.7 -54.3 -54.7 -49.7 2003 -50.3 -48.1 -52.2 -55.7 -57.6 -58.2 -59.4 -60.8 -59.3 -59.7 -54.3 -52.3 2004 -49.8 -51.8 -51.1 -55.3 -56.3 -58.4 -61.9 -60.1 -61.9 -57.3 -53.3 -51.2 2005 -51.3 -51.1 -51.7 -56.7 -54.8 -56.9 -59.9 -60.3 -57.1 -55.5 -56.0 -50.8 2006 -52.7 -52.5 -52.5 -54.2 -57.6 -58.8 -60.6 -61.8 -58.8 -59.8 -55.8 -55.0 2007 -51.2 -53.0 -52.6 -53.9 -55.2 -57.0 -59.9 -59.6 -60.1 -58.0 -54.6 -53.6 2008 -52.7 -51.8 -52.2 -52.1 -56.7 -60.2 -59.6 -60.8 -60.9 -58.3 -53.8 -53.4 2009 -51.9 -49.3 -51.8 -54.8 -57.4 -58.7 -58.0 -61.3 -59.9 -59.3 -53.3 -52.3 2010 -51.2 -50.2 -53.1 -54.6 -58.1 -59.2 -60.5 -61.5 -59.4 -59.3 -56.2 -50.8 2011 -51.1 -50.5 -52.2 -53.5 -55.3 -58.8 -57.6 -60.6 -58.7 -58.9 -53.0 -54.0 2012 -51.1 -51.5 -53.2 -53.7 -56.1 -58.3 -61.0 -60.9 -59.2 -55.4 -52.3 -50.0 2013 -49.3 -50.3 -53.1 -54.4 -57.2 -59.2 -61.0 -60.8 -56.8 -55.5 -53.3 -50.0 2014 -50.9 -50.9 -49.8 -55.9 -54.7 -58.7 -59.9 -61.3 -61.0 -58.4 -52.8 -53.8 2015 -51.6 -50.9 -52.8 -54.7 -56.6 -58.6 -59.8 -59.5 -60.6 -60.8 -54.6 -54.2 2016 -52.0 -51.6 -52.8 -53.8 -56.8 -60.1 -59.8 -59.8 -59.0 -56.7 -53.0 -52.9 2017 -49.8 -51.6 -52.7 -56.0 -55.7 -59.4 -58.8 -61.0 -58.6 -56.6 -56.3 -50.6 2018 -49.6 -49.6 -51.9 -54.6 -57.4 -58.0 -59.8 -60.2 -61.3 -59.6 -56.8 -53.8 2019 -52.1 -50.5 -53.1 -54.4 -56.4 -57.5 -58.9 -59.1 -57.3 -54.2 -52.5 -53.2 2020 -50.6 -48.8 -52.3 -53.0 -55.6 -58.8 -58.0 -58.9 -59.3 -59.0 -56.5 -53.1 2021 -51.9 -51.5 -53.0 -53.3 -58.3 -59.5 -60.2 -61.2 -59.5 -57.3 -56.0 -53.5 2022 -52.3 -50.7 -52.0 -54.7 -55.9 -56.5 -59.6 -59.5 -60.2 -57.7 -56.6 -54.8 2023 -52.2 -50.2 -49.9 -54.1 -57.0 -57.3 -60.6 -60.6 -58.9 -57.8 -56.3 -51.1 2024 -51.7 -52.2 -52.7 -53.3 - - - - - - - -