Casey 12Z 700hPa temperature 1957 - - - -18.8 -21.0 -21.2 -21.7 -22.2 -23.6 -17.9 -18.6 -15.7 1958 -14.3 -18.8 -18.8 -20.0 -17.5 -24.7 -21.2 -24.8 -26.8 -22.7 -20.2 -17.8 1959 -15.9 -16.0 -16.5 -19.6 -21.4 -24.1 -25.2 -23.7 -27.6 -20.7 -21.3 -15.7 1960 -15.7 -16.9 -20.7 -22.1 -21.8 -22.4 -25.9 -23.3 -23.5 -23.1 -19.6 -17.0 1961 -15.4 -14.5 -19.1 -20.7 -22.0 -20.5 - -22.5 -19.9 -21.7 -17.9 -18.8 1962 -18.9 -16.9 -19.0 -20.5 -23.1 -22.0 -24.0 -23.7 -23.1 -21.9 -18.9 -18.8 1963 - - - - - - - - - - - - 1964 - -16.9 -19.4 - - - - - -25.6 -22.7 -18.2 -15.1 1965 -15.3 -16.2 -18.5 - - - - - - - - - 1966 -16.4 -15.4 -15.2 - - - - - - - - - 1967 - - - - - - - - - - - - 1968 - - - - - - - - - -22.5 -19.4 -18.2 1969 -15.4 -15.6 - - - - - - - -22.0 -20.2 -17.7 1970 -15.3 -16.9 -17.2 - - - - - - -21.9 -19.4 -15.1 1971 -13.2 -15.6 -20.2 - - - - - - -22.6 -19.4 -15.7 1972 -14.8 -17.0 -18.1 - - - - - - - -19.8 -15.8 1973 -15.8 -17.8 -18.2 - - - - - - -20.7 -17.9 -17.8 1974 -15.4 -18.1 -19.0 - - - - - - -19.7 -18.5 -14.7 1975 -14.4 -16.4 -17.4 - - - - - - -21.5 -19.3 -17.5 1976 -14.2 -16.4 -17.8 - - - - - - -21.1 -17.9 -13.8 1977 -13.6 -15.5 -18.4 - - - - - - -26.8 -20.8 - 1978 - - - - - - - - - - - - 1979 - - - - - - - - - - - - 1980 - - - - - - - - - - - - 1981 - - - - - - - - - - - - 1982 - - - - - - - - - - - - 1983 - - - - - - - - - - - - 1984 - - - - - - - - - - - - 1985 - - - - - - - - - - - - 1986 - - - - - - - - - - - - 1987 - - - - - - - - - - - - 1988 - - - - - -19.3 -21.9 -21.4 -19.5 -20.2 -20.3 -17.6 1989 -16.1 -16.8 -19.6 -20.6 -21.6 -21.4 -21.7 -21.5 -20.0 -20.5 -20.1 -11.8 1990 -14.2 -16.0 -17.5 -18.4 -19.4 -23.6 -19.6 -22.5 -22.5 -22.0 -18.9 -14.2 1991 -16.6 -14.2 -16.7 -18.4 -20.3 -18.7 -17.8 -20.8 -23.3 -21.1 -17.5 -16.5 1992 -14.5 -15.5 -17.4 -21.2 -20.1 -18.4 -22.2 -21.4 -24.5 -21.0 -19.3 -17.9 1993 -14.9 -16.0 -18.0 -20.4 -23.1 -23.1 -22.0 -23.5 -22.2 -22.8 -20.1 -18.6 1994 -15.1 -17.5 -18.3 -22.4 -20.9 -17.5 -21.4 -24.0 -20.5 -23.0 -19.4 -18.4 1995 -17.2 -17.3 -18.3 -20.5 -21.3 -21.5 -17.0 -21.3 -23.0 -21.8 -17.1 -16.2 1996 -15.0 -16.3 -18.8 -19.1 -22.9 -19.0 -19.5 -19.2 -20.2 -21.2 -18.4 -16.5 1997 -16.4 -17.3 -18.1 -21.6 -20.6 -20.0 -23.8 -23.4 -23.5 -23.1 -17.3 -16.7 1998 -17.1 -16.7 -19.7 -20.7 -21.0 -21.4 -21.8 -20.1 -22.9 -22.5 -17.4 -17.3 1999 -18.0 -15.9 -18.3 -22.3 -22.8 -20.5 -23.4 -22.2 -23.5 -21.4 -20.1 -17.6 2000 -16.1 -17.9 -19.5 -19.4 -22.4 -20.9 -22.3 -22.2 -20.0 -23.7 -16.7 -15.6 2001 -15.0 -13.7 -17.1 -20.5 -21.4 -22.0 -20.8 -24.1 -21.7 -21.1 -19.3 -14.3 2002 -15.4 -16.8 -15.5 -17.2 -16.9 -18.9 -20.4 -22.5 -22.7 -20.4 -18.4 -16.8 2003 -14.0 -13.0 -17.7 -20.6 -20.8 -22.6 -22.7 -22.8 -21.2 -22.0 -18.4 -15.3 2004 -14.5 -16.5 -19.1 -20.5 -20.7 -21.0 - - - - - - 2005 - - - - - - - - - - - -13.2 2006 -15.9 -17.2 -19.2 -18.3 -24.2 -22.9 -22.0 -21.5 -20.3 -21.3 -17.5 -16.7 2007 -14.9 -16.6 -18.3 -18.1 -18.7 -19.6 -18.6 -20.1 -21.4 -22.5 -17.9 -18.0 2008 -17.5 -16.8 -19.7 -19.0 -18.9 -22.4 -21.5 -23.2 -23.9 -22.5 -16.9 -15.5 2009 -16.0 -15.0 -17.8 -21.0 -20.9 -21.0 -18.3 -21.8 -20.4 -21.1 -18.5 -17.3 2010 -14.7 -16.2 -17.2 -20.2 -22.1 -21.7 -23.0 -23.3 -21.0 -21.4 -20.1 -15.7 2011 -13.2 -20.0 -16.9 -18.2 - - - - - - -18.7 -17.4 2012 -16.0 -17.8 -18.6 -19.0 -21.8 -21.8 -24.4 -23.1 -24.5 -21.0 -17.4 -16.6 2013 -14.7 -16.6 -19.8 -20.9 -20.6 -19.8 -22.4 -22.9 -17.4 -22.8 -16.1 -17.2 2014 -14.5 -16.9 -21.3 -21.4 -19.7 -22.6 -22.0 -23.6 -21.6 -21.7 -16.8 -17.7 2015 -15.3 -16.9 -18.1 -20.9 -22.5 -20.9 -23.2 -22.0 -23.0 -23.2 -18.1 -15.5 2016 -16.6 -18.1 -19.1 -20.7 -19.0 -23.6 -22.0 -22.0 -23.1 -20.8 -18.8 -16.2 2017 -14.6 -14.9 -19.8 - - -22.5 -21.5 -23.3 -24.4 -22.2 -18.0 -16.5 2018 -15.9 -16.5 -19.9 -18.2 -21.8 -20.6 -20.3 -22.9 -23.1 -22.7 -20.7 -18.8 2019 -16.4 -15.7 -19.6 -19.6 -21.9 -20.4 -19.3 -21.2 -23.6 -20.8 -17.5 -15.0 2020 -14.7 -16.5 -19.3 -17.5 -20.3 -20.8 -18.9 -21.4 -19.9 -19.0 -17.0 -17.4 2021 -16.5 -16.7 -18.5 -20.8 -22.7 -22.9 -21.5 -20.6 -21.5 -19.5 -20.3 -14.4 2022 -16.5 -16.5 -18.5 -20.5 -20.2 -19.2 -21.3 -21.8 -21.1 -20.0 -20.1 -16.5 2023 -16.5 -14.5 -16.8 -20.4 -22.7 -21.6 -23.1 -26.1 -19.3 -22.2 -19.7 -16.0 2024 -14.7 -18.1 -19.2 -21.1 - - - - - - - -