Casey 12Z 50hPa temperature 1957 - - - -59.5 -57.7 -63.2 - - -67.4 -40.1 -36.1 -39.1 1958 -39.2 -43.0 -47.8 -51.7 - - -76.2 -74.1 -64.9 -45.9 -38.2 -38.5 1959 -38.9 -43.9 -50.4 -55.0 -63.0 -74.4 -80.2 -80.3 -73.9 -64.7 -47.4 -42.8 1960 - -42.6 -48.6 -55.2 -62.6 -69.3 -75.5 -75.2 -68.5 -52.0 -36.6 -36.7 1961 -39.1 -44.0 -48.0 -55.8 - - - - - - - -39.0 1962 -40.3 -43.7 -47.4 -59.2 -65.5 -71.4 -73.2 -70.4 -58.1 -47.2 -38.2 -39.0 1963 - - - - - - - - - - - - 1964 - -44.5 -47.6 - - - - - - - - - 1965 - - - - - - - - - - - - 1966 - - - - - - - - - - - - 1967 - - - - - - - - - - - - 1968 - - - - - - - - - - - - 1969 -40.8 - - - - - - - - - - - 1970 - - - - - - - - - - -40.3 - 1971 -41.2 - - - - - - - - - - - 1972 - - -48.8 - - - - - - - -42.4 -40.8 1973 -40.2 - - - - - - - - - -36.7 -39.7 1974 -40.2 -43.8 -48.3 - - - - - - -48.3 -37.6 - 1975 - -42.9 -50.0 - - - - - - -59.1 -47.2 -39.0 1976 -40.9 -43.0 -48.0 - - - - - - -45.1 -37.7 -41.8 1977 - -45.5 - - - - - - - - - - 1978 - - - - - - - - - - - - 1979 - - - - - - - - - - - - 1980 - - - - - - - - - - - - 1981 - - - - - - - - - - - - 1982 - - - - - - - - - - - - 1983 - - - - - - - - - - - - 1984 - - - - - - - - - - - - 1985 - - - - - - - - - - - - 1986 - - - - - - - - - - - - 1987 - - - - - - - - - - - - 1988 - - - - - - -74.7 -63.3 -45.8 -34.3 -35.9 -39.5 1989 -40.6 -43.9 -50.1 -55.6 -63.2 -72.3 -79.7 -80.1 -72.4 -48.7 -39.0 -40.9 1990 -40.2 -43.4 -49.5 -57.7 -62.1 -71.0 -76.0 -76.9 -62.4 -54.8 -44.0 -40.7 1991 -39.5 -44.1 -49.3 -53.0 -63.7 -74.5 -80.7 -75.9 -58.7 -36.1 -35.7 -39.8 1992 -40.8 -44.5 -49.3 -56.7 -61.4 -66.9 -72.2 -69.6 -57.6 -44.9 -40.9 -38.4 1993 -40.1 -42.9 -48.3 -55.9 -65.9 -76.3 -76.8 -75.3 -70.1 -48.1 -35.7 -37.0 1994 -40.8 -43.5 -48.9 -55.8 -63.1 -67.2 -77.7 -73.0 -69.3 -44.7 -35.9 -36.8 1995 -40.2 -43.5 -49.4 -55.2 -65.7 -74.3 -78.7 -79.0 -60.7 -56.0 -40.3 -38.9 1996 -41.3 -43.9 -48.8 -57.0 -67.9 -71.0 -78.1 -74.4 -53.2 -53.0 -48.5 -38.7 1997 -39.9 -43.7 -48.4 -56.9 -65.6 -73.9 -78.9 -71.1 -63.4 -46.9 -38.3 -42.0 1998 -40.6 -43.3 -50.0 -58.5 -66.2 -65.5 -77.9 -80.2 -65.0 -55.3 -47.3 -40.7 1999 -42.0 -44.5 -50.2 -55.7 -66.8 -73.1 -79.6 -78.8 -67.3 -50.6 -45.5 -38.6 2000 -42.6 -43.3 -48.3 -58.1 -68.0 -75.5 -77.0 -77.7 -60.4 -31.3 -38.3 -41.1 2001 -41.1 -45.7 -49.1 -58.0 -60.8 -66.9 -81.6 -78.8 -72.1 -51.5 -51.6 -43.3 2002 -41.6 -44.0 -49.6 -57.8 -64.9 -71.0 -77.3 -65.3 -43.6 -45.7 -41.4 -42.3 2003 -42.4 -45.5 -49.4 -58.9 -67.0 -73.9 -75.5 -68.7 -60.9 -49.3 -43.4 -41.6 2004 -42.5 -44.6 -48.7 -55.6 -62.4 -72.6 - - - - - - 2005 - - - - - - - - - - - -42.6 2006 -40.7 -43.4 -48.4 -57.1 -65.5 -74.9 - - -55.9 -62.8 -51.1 -38.2 2007 -40.6 -43.1 -49.8 -57.2 -66.5 -72.4 -83.8 -74.9 -52.8 -44.5 -47.6 -41.6 2008 -40.5 -44.0 -50.1 -57.9 -61.5 -75.4 -81.3 -79.7 -71.4 -48.0 -46.6 -41.0 2009 -40.7 -45.3 -49.5 -57.8 -65.2 -75.7 -81.5 -81.1 -68.3 -53.6 -44.8 -38.7 2010 -39.7 -44.3 -48.1 -56.6 -66.5 -74.6 -77.1 -76.2 -68.6 -56.5 -47.8 -45.4 2011 -41.2 -44.1 -48.5 -54.2 - - - - - - -37.8 -38.3 2012 -40.8 -44.0 -48.1 -57.8 -65.7 -74.9 -78.4 -69.7 -55.3 -38.4 -40.9 -40.3 2013 -41.1 -44.1 -49.5 -59.0 -66.4 -75.6 -79.2 -73.3 -50.9 -39.3 -46.2 -40.9 2014 -41.0 -43.5 -49.8 -56.3 -65.4 -72.4 -74.4 -75.9 -63.8 -44.0 -41.4 -38.7 2015 -40.3 -43.3 -49.0 -57.5 -65.0 -73.0 -79.4 -81.1 -76.9 -64.3 -42.2 -40.7 2016 -40.9 -43.7 -50.3 -58.0 -63.7 -73.8 -81.3 -77.9 -58.5 -48.8 -40.0 -40.0 2017 -40.6 -44.4 -49.8 - - -73.7 -78.8 -71.1 -52.2 -47.1 -44.7 -40.1 2018 -40.7 -45.1 -50.1 -55.4 -63.0 -75.3 -80.5 -77.7 -72.2 -52.4 -45.5 -38.2 2019 -40.7 -45.3 -49.6 -56.4 -66.6 -73.4 -75.3 -63.0 -33.5 -41.7 -41.9 -41.0 2020 -41.1 -43.6 -49.1 -56.0 -62.5 -76.0 -77.8 -67.6 -69.7 -61.6 -56.7 -39.7 2021 -41.8 -43.2 -50.7 -56.0 -69.2 -76.0 -81.5 -79.4 -71.7 -58.0 -46.4 -43.3 2022 -41.0 -43.6 -49.1 -58.2 -66.1 -71.9 -79.8 -80.1 -70.9 -60.7 -47.8 -39.5 2023 -41.0 -45.3 -52.5 -57.8 -67.0 -74.6 -78.6 -77.2 -64.1 -50.3 -54.5 -42.2 2024 -41.5 -44.2 -49.5 -58.7 - - - - - - - -