Casey 12Z 850hPa temperature 1957 - - - -12.3 -14.0 -17.6 -17.0 -16.4 -15.4 -13.0 -11.4 -7.4 1958 -6.1 -10.7 -10.5 -12.4 -9.5 -20.7 -15.0 -18.4 -22.9 -17.2 -11.8 -9.2 1959 -8.0 -10.1 -10.7 -12.3 -14.2 -17.9 -18.4 -19.7 -23.1 -14.5 -12.8 -7.9 1960 -7.7 -8.9 -13.5 -15.9 -18.0 -17.3 -22.5 -17.2 -18.5 -17.1 -11.6 -8.2 1961 -7.4 -7.4 -10.6 -14.5 -15.0 -14.5 - -15.6 -14.6 -17.3 -11.1 -9.8 1962 -9.6 -7.6 -10.8 -14.1 -17.1 -16.3 -19.5 -19.0 -15.5 -13.9 -11.6 -9.7 1963 - - - - - - - - - - - - 1964 - -11.2 -12.1 - - - - - -21.7 -15.6 -10.5 -8.6 1965 -6.9 -8.7 -12.8 - - - - - - - - - 1966 -8.8 -8.3 -9.2 - - - - - - - - - 1967 - - - - - - - - - - - - 1968 - - - - - - - - - -15.2 -11.5 -9.7 1969 -6.7 -7.2 - - - - - - - -15.9 -13.2 -9.5 1970 -7.5 -9.2 -10.6 - - - - - - -15.9 -10.0 -8.1 1971 -6.3 -8.8 -10.7 - - - - - - -14.5 -12.1 -8.3 1972 -6.0 -8.7 -10.8 - - - - - - - -12.4 -8.1 1973 -7.8 -8.9 -10.2 - - - - - - -14.4 -9.6 -9.1 1974 -6.5 -10.8 -11.1 - - - - - - -12.5 -10.2 -7.0 1975 -6.7 -10.6 -11.2 - - - - - - -15.3 -10.5 -8.4 1976 -6.4 -8.1 -12.6 - - - - - - -13.6 -9.9 -6.7 1977 -4.9 -9.1 -11.4 - - - - - - -18.6 -14.0 - 1978 - - - - - - - - - - - - 1979 - - - - - - - - - - - - 1980 - - - - - - - - - - - - 1981 - - - - - - - - - - - - 1982 - - - - - - - - - - - - 1983 - - - - - - - - - - - - 1984 - - - - - - - - - - - - 1985 - - - - - - - - - - - - 1986 - - - - - - - - - - - - 1987 - - - - - - - - - - - - 1988 - - - - - -14.5 -16.8 -16.8 -14.4 -14.2 -12.0 -9.0 1989 -8.2 -9.4 -13.1 -14.9 -14.9 -17.8 -15.2 -14.3 -13.1 -12.4 -13.3 -5.4 1990 -6.6 -8.1 -10.9 -12.3 -16.0 -19.6 -14.1 -15.7 -16.8 -16.8 -10.8 -6.5 1991 -7.5 -7.4 -10.4 -10.7 -15.0 -11.5 -12.5 -13.2 -16.3 -13.5 -9.8 -6.9 1992 -6.9 -7.9 -10.6 -13.8 -15.7 -12.8 -16.1 -13.6 -18.2 -15.8 -10.9 -9.4 1993 -5.9 -7.2 -11.3 -13.3 -17.2 -18.2 -17.3 -17.4 -16.6 -17.4 -12.6 -10.3 1994 -8.0 -8.9 -10.9 -16.2 -16.5 -11.6 -15.0 -19.3 -13.3 -14.9 -12.2 -9.5 1995 -8.8 -10.6 -12.3 -14.6 -17.3 -14.9 -10.9 -13.9 -15.8 -17.1 -10.2 -8.7 1996 -7.8 -9.2 -10.4 -11.4 -17.4 -13.8 -12.2 -13.0 -14.4 -14.8 -10.1 -7.7 1997 -7.6 -8.8 -11.3 -14.7 -16.3 -12.7 -17.3 -18.1 -16.8 -16.9 -9.2 -7.8 1998 -8.0 -9.7 -13.5 -14.4 -12.1 -15.5 -17.3 -14.5 -18.1 -15.4 -10.3 -8.2 1999 -9.4 -8.7 -12.5 -16.8 -17.9 -14.9 -17.7 -16.3 -18.8 -13.8 -12.1 -9.8 2000 -8.1 -9.0 -12.4 -14.2 -17.3 -17.1 -16.8 -15.0 -12.5 -18.2 -9.8 -8.2 2001 -6.7 -9.5 -9.1 -12.7 -14.0 -16.3 -13.8 -17.0 -14.0 -15.2 -11.1 -7.5 2002 -6.5 -9.1 -9.5 -9.9 -13.4 -13.2 -13.4 -17.1 -16.4 -15.2 -10.1 -8.8 2003 -6.9 -7.2 -10.2 -13.3 -16.2 -16.4 -18.0 -16.5 -16.6 -15.8 -11.4 -8.0 2004 -6.8 -8.0 -11.3 -12.6 -14.5 -13.4 - - - - - - 2005 - - - - - - - - - - - -5.6 2006 -7.9 -9.7 -11.2 -10.3 -18.2 -15.9 -15.4 -14.6 -14.8 -16.4 -11.4 -8.5 2007 -7.2 -8.5 -10.4 -11.7 -13.5 -14.2 -12.7 -15.3 -15.8 -15.1 -10.0 -9.2 2008 -8.8 -10.2 -12.7 -12.3 -12.3 -14.9 -14.1 -15.9 -17.6 -16.0 -9.8 -7.8 2009 -7.9 -7.6 -10.5 -15.3 -12.6 -14.4 -11.5 -15.9 -13.0 -12.8 -11.9 -8.8 2010 -5.8 -10.2 -12.6 -14.9 -15.5 -15.1 -16.9 -17.1 -15.8 -14.6 -12.2 -8.8 2011 -6.4 -11.2 -11.1 -13.1 - - - - - - -11.7 -8.5 2012 -8.5 -9.8 -12.1 -13.9 -16.3 -16.7 -19.5 -16.7 -18.6 -13.9 -11.2 -8.7 2013 -6.8 -9.4 -13.6 -15.8 -14.5 -14.2 -18.1 -17.7 -11.7 -16.9 -10.7 -8.0 2014 -5.8 -8.6 -15.2 -15.7 -14.6 -18.4 -15.0 -20.1 -16.2 -13.9 -10.5 -8.1 2015 -7.1 -7.7 -10.9 -15.8 -16.4 -15.8 -18.6 -16.3 -16.4 -17.9 -10.6 -7.7 2016 -8.2 -10.8 -12.0 -14.1 -12.2 -17.6 -17.9 -15.8 -17.5 -15.3 -10.1 -8.1 2017 -6.8 -8.9 -11.2 - - -18.4 -15.9 -18.3 -18.2 -18.4 -10.1 -8.1 2018 -7.2 -8.3 -13.1 -10.6 -15.0 -15.0 -13.6 -18.4 -17.2 -14.9 -11.2 -9.2 2019 -7.3 -8.1 -10.9 -12.9 -15.9 -15.6 -13.6 -16.5 -17.7 -15.2 -10.2 -8.3 2020 -6.2 -8.8 -12.9 -11.8 -14.4 -14.1 -13.9 -16.3 -14.5 -12.7 -10.7 -9.3 2021 -7.8 -8.5 -9.9 -16.9 -17.5 -16.6 -15.6 -13.0 -15.2 -11.6 -12.6 -7.0 2022 -8.3 -8.6 -11.1 -14.2 -13.4 -15.2 -14.5 -17.1 -13.6 -12.3 -11.3 -8.5 2023 -7.8 -8.1 -11.0 -12.0 -16.9 -15.9 -17.4 -19.9 -14.1 -16.2 -11.9 -8.5 2024 -7.0 -10.4 -12.4 -17.3 - - - - - - - -