Casey 00Z 700hPa temperature 1957 - - - -18.3 -20.8 -20.7 -21.3 -22.6 -23.2 -19.3 -18.9 -16.3 1958 -14.6 -19.4 -18.6 -20.0 -18.0 -23.7 -21.8 -24.8 -26.9 -23.5 -20.5 -17.7 1959 -16.6 -16.7 -16.5 -18.9 -20.9 -23.4 -24.9 -23.0 -27.4 -21.2 -21.7 -15.6 1960 -15.8 -17.1 -20.5 -22.2 -22.1 -22.6 -25.7 -23.2 -23.5 -22.2 -20.4 -17.6 1961 -16.2 -14.4 -19.4 -21.0 -21.1 -21.1 -22.6 -22.5 -20.7 -22.0 -18.6 -18.7 1962 -19.2 -17.0 -19.4 -20.3 -23.4 -22.0 -24.5 -23.8 -23.3 -22.2 -18.6 -19.0 1963 -15.0 -19.3 -19.7 -22.6 -21.3 -23.2 -24.6 -21.3 -23.5 -24.2 -20.5 -17.3 1964 -16.4 -16.8 -19.1 -21.2 -21.9 -19.4 -21.2 -21.5 -24.0 -23.0 -18.1 -15.6 1965 -15.4 -15.3 -19.7 -20.3 -23.0 -23.2 -23.8 -24.5 -25.1 -23.5 -21.2 -15.6 1966 -16.7 -15.6 -17.3 -21.8 -20.0 -22.7 -20.5 -25.8 -22.2 -22.3 -18.4 -15.5 1967 -12.9 -18.9 -18.4 -21.4 - -20.8 -21.2 -24.5 -21.7 -24.4 -17.4 -17.2 1968 -15.9 -18.3 -19.2 -20.8 -22.2 -20.7 -22.7 -24.6 -24.2 -21.9 -19.7 -18.6 1969 -15.3 -16.0 - -21.4 -23.0 -21.1 -24.5 -26.2 -23.3 -21.8 -20.2 -17.6 1970 -15.5 -17.2 -16.8 -19.5 -19.2 -19.9 -22.5 -23.6 -22.0 -22.3 -19.6 -14.9 1971 -13.8 -16.2 -20.3 -19.6 -20.3 -21.8 -23.0 -22.3 -21.7 -21.9 -19.4 -15.6 1972 -15.0 -17.1 -18.5 -20.5 -23.0 -21.3 -22.9 -21.3 -23.9 -24.4 -20.3 -16.5 1973 -15.9 -18.4 -18.6 -19.5 -18.8 -19.5 -22.6 -23.4 -20.6 -21.1 -18.2 -18.4 1974 -15.5 -17.5 -19.8 -21.6 -23.3 -20.9 -23.0 -21.5 -24.6 -19.8 -18.3 -15.3 1975 -14.8 -16.8 -18.1 -22.4 -19.7 -20.1 -20.6 -25.0 -24.8 -21.9 -19.1 -17.8 1976 -14.8 -16.9 -18.2 -22.3 -21.3 -20.0 -22.8 -23.2 -22.7 -21.3 -18.0 -14.3 1977 -14.0 -15.4 -18.5 -20.4 -21.6 -22.1 -22.1 -21.6 -26.1 -23.3 -19.9 -16.9 1978 -16.7 -16.4 -19.1 -20.5 -20.6 -20.2 -22.3 -24.1 -25.3 -22.7 -18.3 -14.9 1979 -16.4 -17.4 -19.1 -19.5 -20.7 -22.9 -24.0 -23.4 -23.9 -20.6 -18.4 -15.7 1980 -14.8 -17.3 -18.2 -19.3 -21.1 -22.0 -19.1 -21.4 -22.8 -23.0 -17.7 -17.1 1981 -16.6 -16.1 -17.8 -20.3 -22.3 -19.1 -22.0 -19.3 -22.5 -22.2 -19.4 -16.9 1982 -15.5 -17.0 -20.1 -23.5 -21.1 -22.1 -19.9 -26.7 -24.5 -21.4 -18.0 -15.1 1983 -15.3 -16.4 -18.3 -19.2 -19.7 -20.3 -24.5 -22.3 -21.6 -22.8 -21.4 -17.0 1984 -13.8 -17.1 -17.6 -18.5 -18.2 -23.8 -22.7 -20.8 -23.3 -23.6 -18.7 -14.3 1985 -13.7 -16.4 -17.8 -18.9 -22.2 -20.0 -23.4 -21.8 -23.2 -22.7 -20.1 -17.6 1986 -16.8 -13.7 -18.0 -20.9 -19.8 -22.7 -21.6 -22.6 -21.6 -21.2 -18.5 -17.0 1987 -13.3 -15.3 -18.1 -20.8 -22.5 -22.6 -21.3 -25.2 -25.2 -21.4 -19.7 -16.6 1988 -14.5 -18.1 -17.3 -18.8 -18.8 -19.6 -21.7 -21.9 -19.5 -20.2 -19.7 -17.8 1989 -16.5 -16.6 -20.2 -20.7 -21.4 -21.6 -21.5 -21.4 -19.7 -20.2 -20.0 -12.0 1990 -14.5 -16.3 -17.7 -18.1 -19.3 -23.7 -19.1 -22.6 -22.5 -22.0 -18.9 -14.5 1991 -17.1 -14.9 -16.7 -18.5 -21.2 -18.1 -18.9 -20.5 -24.2 -21.0 -17.9 -16.6 1992 -14.4 -15.5 -17.6 -21.5 -19.8 -18.8 -22.2 -21.0 -24.8 -21.2 -19.5 -18.1 1993 -15.0 -16.2 -17.7 -20.3 -22.8 -23.4 -21.9 -23.7 -21.7 -23.0 -20.3 -18.8 1994 -15.3 -18.0 -18.6 -22.1 -21.1 -17.8 -21.6 -23.5 -20.6 -23.0 -19.6 -18.8 1995 -17.4 -17.5 -18.3 -19.8 -21.8 -21.7 -16.9 -20.9 -22.9 -22.1 -17.4 -16.6 1996 -15.2 -16.6 -19.0 -19.3 -22.7 -18.7 -19.0 -18.7 -20.3 -21.3 -18.5 -17.0 1997 -16.4 -17.3 -18.5 -21.4 -20.3 -20.1 -23.2 -23.3 -23.6 -22.6 -17.7 -16.7 1998 -17.3 -16.6 -19.5 -20.6 -21.2 -21.1 -22.2 -19.8 -23.1 -22.5 -17.7 -17.4 1999 -18.5 -15.7 -18.4 -22.4 -22.7 -21.0 -23.5 -22.7 -23.9 -21.1 -20.2 -17.9 2000 -16.5 -18.4 -19.4 -19.6 -22.0 -20.8 -22.0 -22.4 -20.0 -23.5 -17.0 -16.0 2001 -15.1 -13.7 -17.2 -20.1 -20.8 -22.0 -20.7 -24.3 -22.1 -21.2 -19.4 -14.3 2002 -15.6 -17.2 -15.3 -18.0 -16.9 -19.2 -20.2 -22.4 -22.7 -20.6 -19.1 -16.5 2003 -14.7 -13.3 -17.7 -20.0 -21.2 -22.3 -22.4 -22.9 -21.5 -22.4 -18.3 -15.9 2004 -14.7 -16.2 -19.2 -20.7 -19.8 -20.6 -23.0 -21.6 -23.4 -20.3 -18.4 -15.2 2005 -16.0 -16.8 -16.9 -21.8 -19.7 -20.2 -22.3 -23.1 -20.5 -21.3 -19.4 -13.5 2006 -16.1 -17.9 -19.3 -17.9 -24.2 -22.8 -22.2 -21.2 -22.6 -21.5 -17.8 -17.2 2007 -15.7 -16.9 -18.8 -19.0 -18.2 -19.1 -19.2 -20.6 -21.7 -22.5 -18.0 -18.7 2008 -17.9 -16.8 -19.7 -19.1 -18.5 -22.3 -22.1 -23.2 -23.9 -22.9 -17.2 -16.4 2009 -16.0 -15.6 -18.4 -21.0 -21.1 -20.8 -18.6 -22.1 -20.6 -21.3 -18.8 -17.4 2010 -14.9 -16.0 -17.2 -20.2 -22.1 -21.4 -23.6 -22.7 -20.8 -21.9 -20.3 -16.0 2011 -13.7 -20.3 -17.5 -19.2 -20.4 -21.9 -17.5 -21.0 -21.7 -23.6 -19.1 -17.9 2012 -16.5 -18.2 -18.7 -18.5 -21.3 -21.5 -24.5 -24.0 -24.3 -21.3 -18.2 -17.0 2013 -14.6 -16.8 -20.3 -21.1 -20.1 -19.9 -22.2 -23.3 -17.4 -22.1 -16.6 -17.6 2014 -14.6 -16.6 -19.9 -21.3 -19.8 -22.8 -22.5 -23.9 -22.2 -21.8 -17.3 -17.8 2015 -15.8 -17.4 -18.0 -21.4 -22.7 -21.4 -23.1 -22.3 -22.3 -23.4 -17.9 -16.1 2016 -16.5 -18.6 -19.0 -21.0 -19.2 -23.4 -22.3 -22.3 -23.6 -21.1 -18.7 -16.7 2017 -14.6 -15.0 -19.5 -20.7 -19.8 -22.5 -21.4 -23.1 -24.3 -23.3 -18.1 -16.7 2018 -16.4 -16.9 -20.3 -18.1 -21.7 -20.9 -21.2 -22.9 -23.5 -22.4 -21.1 -19.5 2019 -16.8 -16.0 -19.8 -19.4 -21.9 -20.8 -19.4 -21.0 -23.7 -21.2 -18.1 -15.2 2020 -14.8 -16.6 -19.4 -17.4 -19.9 -21.2 -19.2 -21.5 -19.8 -18.7 -17.3 -18.0 2021 -16.8 -16.5 -18.5 -20.6 -22.5 -23.1 -22.2 -20.1 -21.3 -19.3 -20.6 -14.6 2022 -16.8 -16.5 -18.9 -20.5 -19.9 -18.6 -20.7 -21.6 -21.0 -20.3 -20.3 -17.1 2023 -16.7 -15.5 -16.9 -19.9 -23.0 -21.4 -22.9 -26.1 -19.5 -22.3 -20.1 -15.9 2024 -15.8 -18.2 -19.4 -20.8 - - - - - - - -