Casey 00Z 50hPa temperature 1957 - - - -58.5 -58.5 -61.7 - -76.1 -67.7 -39.9 -35.8 -39.2 1958 -39.1 -41.8 -47.3 -51.3 -62.2 -65.8 -74.9 -74.6 -67.2 -45.0 -37.9 -37.8 1959 -38.8 -43.4 -48.8 -53.1 -62.6 -73.6 -80.2 -79.6 -72.9 -62.1 -45.7 -41.2 1960 - -40.4 -46.5 -53.7 -61.7 -69.8 -74.8 -73.2 -66.6 -49.9 -34.4 -35.9 1961 -36.9 -42.6 -47.7 -54.3 -67.7 -68.2 - - -70.3 -59.6 -43.3 - 1962 -39.2 -42.7 -46.5 -57.8 -64.7 -72.4 -71.2 -68.5 -57.8 -44.8 -38.0 -38.4 1963 -39.8 -41.8 -47.8 -55.7 -62.5 -73.4 - -77.6 -68.1 -55.6 -36.3 -40.1 1964 -40.8 -42.3 -45.8 -55.2 -67.2 - -76.3 -68.4 -55.0 -32.7 -37.5 -39.4 1965 -40.2 -43.4 -47.2 -53.7 - -72.3 -75.6 -78.3 -70.5 -56.2 -39.4 -40.8 1966 -39.8 -42.9 -48.3 -52.4 -63.3 -63.7 - -75.7 -70.6 -55.0 -36.7 -39.7 1967 -41.0 -43.4 -47.4 -56.2 - -71.1 - - -59.6 -41.7 -39.9 -40.2 1968 -39.6 -41.7 -48.8 -54.9 -61.7 - - - -67.0 -48.0 -35.7 -39.1 1969 -39.2 - - -57.0 -61.8 -70.3 - -71.8 -68.2 -59.5 -37.0 -40.0 1970 -40.9 -42.0 -47.2 -53.5 -63.6 - - -72.1 -60.4 -46.8 -40.2 -38.7 1971 -40.9 -43.6 -48.3 -55.4 -56.9 -71.8 -77.3 -78.4 -66.5 -43.9 -41.1 -41.2 1972 -40.9 -42.9 -47.6 -54.8 -66.2 -77.6 -72.9 -79.6 -70.3 -53.0 -40.7 -40.5 1973 -40.3 -42.9 -48.1 -56.6 -62.1 -70.0 -78.0 -74.2 -59.9 -53.2 -38.3 -39.8 1974 -40.5 -43.4 -48.2 -57.6 -66.5 - - - -60.0 -50.3 -37.9 -39.3 1975 -41.0 -42.6 -50.4 -56.3 -66.2 -74.4 -76.4 -63.4 -53.1 -60.0 -47.0 -38.9 1976 -41.2 -43.1 -47.0 -56.5 -65.5 -74.8 - -79.3 -67.7 -46.5 -36.8 -41.5 1977 - -43.4 -49.2 -55.8 -63.0 -66.5 - - -57.2 -40.2 -35.9 -38.7 1978 -39.4 -42.2 -47.9 -56.9 - - -77.9 -73.7 -64.2 -47.3 -40.9 - 1979 -39.4 -42.7 -47.6 -55.3 -65.6 - - - -68.4 -37.9 -40.5 -39.1 1980 -40.3 -42.1 -48.9 -55.8 -60.8 -66.9 -78.1 -81.4 -72.1 -46.3 -38.4 -38.0 1981 -39.0 -42.8 -46.8 -53.9 -65.9 -73.0 -78.4 -79.1 -69.3 -51.4 -39.0 -38.9 1982 -39.9 -43.8 -48.4 -56.8 -69.8 -75.0 - -78.9 -60.4 -50.6 -39.4 -40.4 1983 -40.0 -42.3 -47.4 -56.2 -66.6 -74.1 -79.1 -77.5 -69.0 -50.6 -36.6 -40.5 1984 -40.4 -42.5 -48.2 -57.5 -64.1 -68.0 -78.4 -76.8 -62.4 -47.0 -37.2 -40.5 1985 -42.1 -43.6 -48.5 -58.5 -65.0 -75.8 -79.1 -75.6 -73.8 -57.9 -39.7 -40.1 1986 -41.4 -45.4 -49.0 -57.1 -63.7 -71.9 -77.3 -77.9 -62.2 -57.3 -36.9 -39.5 1987 -40.8 -43.2 -48.3 -57.3 -67.4 -71.1 -80.3 -79.4 -75.2 -60.6 -49.6 -38.6 1988 -41.1 -43.1 -49.7 -58.5 -66.2 -72.7 -74.2 -65.3 -45.9 -34.5 -35.6 -39.5 1989 -40.9 -44.0 -50.1 -55.3 -64.3 -71.8 -79.5 -80.4 -73.0 -52.6 -38.5 -41.4 1990 -40.6 -43.3 -49.8 -57.8 -62.5 -71.1 -76.5 -77.4 -63.3 -56.3 -44.9 -40.5 1991 -39.7 -44.2 -48.7 -52.7 -63.5 -74.2 -80.3 -76.0 -60.0 -38.1 -35.7 -39.6 1992 -40.6 -44.4 -48.9 -56.8 -62.6 -66.8 -71.9 -71.2 -59.6 -44.7 -41.0 -38.7 1993 -40.2 -42.9 -48.0 -56.3 -65.8 -76.5 -77.2 -75.7 -70.8 -49.4 -36.1 -37.5 1994 -40.9 -43.6 -49.0 -55.4 -63.6 -67.6 -78.0 -73.6 -68.9 -45.1 -36.2 -36.8 1995 -40.3 -43.3 -49.2 -55.3 -65.7 -74.3 -79.2 -79.7 -60.1 -56.8 -40.2 -38.4 1996 -41.3 -44.3 -49.3 -57.2 -67.8 -71.5 -78.2 -74.8 -54.9 -61.7 -49.1 -39.2 1997 -40.1 -44.2 -48.9 -57.0 -64.9 -74.0 -79.0 -71.2 -62.5 -53.8 -38.0 -42.0 1998 -40.9 -43.5 -49.8 -58.6 -66.7 -65.4 -78.1 -80.0 -65.6 -56.6 -47.4 -40.8 1999 -41.7 -46.3 -50.4 -56.2 -66.3 -73.1 -79.2 -79.1 -68.5 -52.0 -45.6 -38.4 2000 -42.5 -43.5 -48.8 -58.4 -67.6 -75.5 -77.4 -78.1 -62.8 -32.3 -38.1 -41.3 2001 -40.9 -46.2 -49.4 -57.6 -61.2 -66.5 -81.5 -79.2 -72.6 -51.6 -52.9 -43.0 2002 -41.7 -44.4 -49.6 -57.3 -64.4 -71.9 -76.3 -65.2 -45.1 -45.9 -41.5 -42.3 2003 -42.7 -45.3 -49.0 -58.4 -66.7 -73.4 - - -63.5 -49.8 -42.8 -41.6 2004 -42.5 -44.8 -48.8 -55.5 -62.2 -72.4 -77.9 -71.4 -61.8 -45.7 -43.4 -39.9 2005 -40.2 -43.7 -50.4 -57.0 -63.3 -70.8 -78.0 -73.9 -50.1 -43.3 -38.5 -43.5 2006 -40.8 -43.8 -48.5 -57.1 -65.8 -72.1 - - -66.3 -63.1 -51.4 -38.3 2007 -40.8 -43.3 -49.6 -57.1 -66.6 -71.7 -83.9 -75.1 -54.6 -44.3 -47.5 -41.7 2008 -40.8 -44.2 -50.5 -58.0 -62.0 -75.4 -81.4 -80.1 -72.2 -49.6 -45.9 -41.3 2009 -40.9 -45.7 -49.7 -57.9 -65.3 -75.7 -82.2 -81.0 -70.0 -53.5 -45.3 -38.7 2010 -39.8 -44.2 -47.9 -56.6 -66.9 -74.6 -77.7 -76.6 -70.0 -56.1 -48.8 -45.6 2011 -41.4 -44.5 -48.8 -56.2 -65.5 -76.3 -80.0 -81.4 -66.8 -50.9 -38.7 -38.6 2012 -40.6 -43.9 -48.3 -57.5 -65.9 -75.2 -78.7 -69.6 -56.3 -37.1 -41.0 -40.2 2013 -41.3 -44.2 -49.7 -58.8 -66.5 -76.4 -80.1 -75.8 -51.3 -38.8 -46.2 -41.1 2014 -41.2 -44.3 -49.2 -56.1 -65.7 - -74.6 -77.0 -63.4 -44.3 -41.4 -39.1 2015 -40.6 -43.1 -48.9 -56.8 -64.8 -74.0 -79.3 -80.9 -77.1 -65.2 -43.0 -41.0 2016 -41.0 -43.8 -50.0 -58.0 -63.6 -74.4 -80.9 -76.7 -59.3 -50.1 -40.3 -40.2 2017 -41.2 -44.4 -49.5 -58.6 -66.2 -73.6 -78.5 -71.3 -56.1 -48.8 -44.2 -40.2 2018 -41.1 -45.2 -49.6 -55.8 -63.5 -75.3 -80.9 -77.9 -71.7 -52.5 -45.6 -38.0 2019 -40.6 -45.3 -49.7 -56.2 -67.7 -73.9 -75.3 -64.9 -34.0 -41.3 -42.2 -41.7 2020 -41.1 -43.8 -49.3 -56.1 -63.0 -75.8 -77.8 -68.0 -71.1 -63.0 -58.3 -40.3 2021 -41.7 -43.5 -50.2 -56.2 -68.8 -76.6 -82.1 -79.6 -71.1 -58.5 -47.4 -44.0 2022 -41.4 -43.6 -49.3 -58.5 -66.3 -71.8 -80.2 -80.3 -70.8 -61.4 -48.2 -39.0 2023 -41.2 -45.0 -52.2 -58.3 -68.6 -73.5 -78.4 -77.3 -65.4 -53.4 -54.1 -42.5 2024 -41.8 -44.6 -49.3 -58.7 - - - - - - - -