Davis 00Z 500hPa temperature 1959 - - - -37.0 -37.5 -37.5 -40.7 -39.5 -40.8 -35.8 -36.0 -30.5 1960 -30.0 -31.2 -36.2 -35.1 -38.1 -41.0 -40.7 -39.8 -39.6 -38.2 -35.7 - 1961 - -31.9 -34.6 -34.3 -36.1 -36.2 -40.2 -40.3 -36.6 -36.2 -33.1 -35.4 1962 -34.7 -32.5 -37.0 -36.0 -38.8 -34.7 -41.9 -41.9 -40.1 -39.0 -35.2 -32.1 1963 -29.7 -32.2 -35.1 -38.2 -37.9 -37.0 -39.8 -36.0 -37.3 -39.3 -37.6 -30.8 1964 -30.3 -32.0 -34.3 -36.6 -37.5 -37.7 -36.5 -38.4 -42.3 -38.3 - - 1965 - - - - - - - - - - - - 1966 - - - - - - - - - - - - 1967 - - - - - - - - - - - - 1968 - - - - - - - - - - - - 1969 - - - -37.2 -36.7 - -41.7 -43.0 -40.6 -38.8 -34.6 -29.6 1970 -31.3 -34.0 -29.9 -35.2 -34.3 -40.5 -38.1 -39.8 -40.9 -39.9 -35.4 -31.0 1971 -27.7 -29.1 -34.9 -36.8 -38.9 -41.6 -40.2 -39.5 -39.5 -37.5 -36.2 -28.5 1972 -29.0 -32.8 -35.8 -36.3 -38.9 -41.6 -39.3 -36.3 -37.9 -37.3 -35.8 -31.9 1973 -31.0 -32.9 -35.5 -35.6 -35.2 -37.5 -41.5 -41.2 -37.6 -36.0 -34.1 -33.3 1974 -31.0 -31.0 -35.9 -36.2 -39.0 -37.6 -38.8 -38.8 -40.4 -36.8 -33.5 -29.9 1975 -30.0 -31.7 -33.2 -38.1 -36.5 -37.3 -39.2 -39.7 -40.3 -37.9 -34.2 -32.7 1976 -29.7 -32.3 -34.9 -38.3 -40.7 -39.8 -40.4 -41.3 -41.0 -40.0 -34.8 -31.1 1977 -30.5 -31.7 -37.8 -38.8 -37.0 -38.2 -37.7 -36.2 -41.5 -38.5 -35.1 -34.0 1978 -33.0 -33.2 -33.3 -35.6 -36.5 -40.5 -39.3 -42.3 -38.5 -38.9 -32.9 -33.0 1979 -29.3 -31.4 -37.2 -34.1 -37.9 -41.0 -41.3 -41.8 -39.5 -39.1 -31.8 -32.5 1980 -29.7 -32.2 -34.4 -33.1 -40.2 -39.2 -37.7 -37.4 -36.6 -39.3 -33.6 -31.8 1981 -31.4 -30.2 -33.5 -37.7 -40.1 -40.6 -38.5 -37.8 -38.9 -40.1 -35.5 -29.5 1982 -31.8 -31.9 -36.9 -40.2 -39.5 -40.4 -41.0 -42.0 -41.8 -40.5 -32.8 -28.8 1983 -31.3 -33.3 -34.1 -38.3 -37.1 -38.2 -40.1 -40.4 -38.5 -38.4 -37.3 -32.8 1984 -30.2 -33.1 -33.9 -36.5 -35.7 -40.1 -41.3 -39.5 -39.8 -41.4 -34.7 -29.2 1985 -28.5 -32.4 -34.7 -35.3 -38.3 -35.5 -40.8 -40.1 -40.5 -39.3 -37.7 -33.2 1986 -29.7 -29.6 -32.8 -36.0 -36.3 -39.6 -39.4 -41.6 -38.9 -38.1 -34.8 -32.2 1987 -29.5 -31.9 -34.1 -35.5 -39.8 -38.5 -39.7 -42.8 -42.1 -37.1 -33.2 -32.3 1988 -29.0 -34.9 -34.1 -37.5 - -36.5 -38.4 -39.8 -37.2 -36.0 -34.5 -31.6 1989 -31.0 -31.3 -35.2 -38.1 -40.0 -38.4 -38.7 -37.7 -37.1 -37.5 -35.3 -30.5 1990 -29.6 -30.9 -35.1 -32.9 -36.5 -39.7 -34.5 -40.4 -42.1 -36.5 -34.1 -31.1 1991 -32.3 -32.0 -30.5 -35.9 -37.1 -34.7 -34.0 -38.7 -39.6 -38.6 -34.8 -30.5 1992 -30.8 -32.0 -33.6 -35.4 -34.6 -36.5 -38.2 -41.1 -42.5 -38.4 -35.2 - 1993 -28.5 -32.4 -35.1 -36.8 -41.5 -39.6 -38.7 -40.1 -39.7 -37.6 -36.2 -32.9 1994 -31.7 -32.6 -34.5 -36.6 -38.5 - -36.9 -40.8 -39.0 -38.6 -33.1 -32.8 1995 -31.2 -29.8 -34.4 -33.7 -37.4 -38.9 -36.3 -39.5 -41.4 -39.3 -33.9 -31.6 1996 -30.1 -29.9 -33.2 -35.4 -39.9 -36.6 -39.4 -37.0 -37.2 -36.8 -34.2 -31.2 1997 -30.4 -32.7 -33.4 -36.1 -38.0 -38.7 -40.9 -39.8 -43.1 -37.4 -36.3 -29.8 1998 -30.7 -31.4 -33.0 -37.9 -38.6 -37.2 -38.6 -39.1 -37.9 -37.7 -34.5 -33.8 1999 -31.0 -32.6 -34.2 -38.9 -37.7 -36.7 -41.0 -39.8 -39.0 -39.1 -34.2 -34.2 2000 -30.9 -32.5 -34.5 -34.3 -38.1 -33.4 -39.7 -40.0 -37.5 -40.9 -34.1 -29.9 2001 -29.6 -29.7 -33.4 -38.4 -37.6 -38.3 -38.5 -41.0 -40.1 -38.0 -35.6 -32.0 2002 -32.3 -31.9 -33.3 -35.3 -34.5 -38.4 -38.8 -38.8 -38.3 -35.6 -34.5 -31.8 2003 -27.8 -30.3 -34.3 -37.6 -37.7 -40.0 -38.3 -40.2 -37.9 -39.8 -33.9 -31.5 2004 -29.3 -28.5 -34.3 -36.4 -37.0 -39.1 - -42.6 -41.1 -36.6 -34.4 -30.5 2005 -30.5 -28.9 -32.0 -38.0 -36.6 -36.7 -37.9 -39.8 -38.1 -37.2 -35.4 -28.8 2006 -31.8 -31.2 -35.1 -36.4 -38.0 -39.1 -41.7 -38.7 -38.3 -37.1 -34.8 -32.8 2007 -29.3 -32.5 -36.2 -32.9 -34.6 -36.4 -37.4 -38.2 -40.7 -37.5 -33.4 -31.3 2008 -32.9 -31.8 -34.1 -35.4 -36.6 -41.0 -36.7 -42.9 -39.9 -39.1 -35.2 -31.9 2009 -29.2 -28.8 -32.2 -34.7 -36.2 -34.5 -36.9 -39.6 -38.0 -38.8 -33.7 -32.6 2010 -29.4 -29.7 -33.5 -37.8 -37.9 -40.1 -41.5 -41.0 -37.0 -38.6 -34.6 -32.5 2011 -27.4 -32.7 -34.2 -35.5 -37.9 -35.5 -36.2 -38.4 -38.6 -39.1 -31.9 -34.7 2012 -30.9 -31.0 -34.8 -35.4 -37.5 -39.1 -40.7 -39.5 -40.7 -36.2 -31.7 -29.7 2013 -27.8 -30.5 -35.1 -36.1 -39.8 -35.8 -40.0 -38.6 -35.8 -35.3 -32.0 -31.1 2014 -30.0 -31.8 -34.8 -38.5 -34.1 -38.8 -38.4 -40.6 -37.4 -37.0 -34.7 -32.2 2015 -30.2 -32.0 -31.9 - - - - - - -39.7 -34.4 -31.3 2016 -32.1 -31.0 -33.8 -34.3 -38.3 -39.2 -39.5 -37.0 -37.9 -36.3 -33.1 -31.9 2017 -30.5 -32.6 -34.1 -38.7 -37.4 -39.2 -37.6 -39.6 -40.1 -37.6 -33.0 -31.6 2018 -28.4 -29.1 -33.5 -33.5 -40.3 -36.9 -37.4 -36.6 -40.2 -38.7 -35.4 -30.9 2019 -29.9 -28.3 -34.0 -34.7 -38.4 -36.3 -39.3 -39.3 -39.8 -34.6 -30.7 -29.5 2020 -27.8 -30.7 -35.0 -35.6 -35.0 -36.2 -36.7 -38.3 -37.8 -36.1 -32.2 -31.1 2021 -30.8 -31.7 -34.1 -35.6 -37.8 -40.5 -40.0 -38.1 -38.7 -36.8 -34.1 -32.4 2022 -31.0 -32.4 -33.3 -36.5 -38.0 -34.2 -39.8 -37.3 -40.7 -36.2 -35.0 -32.9 2023 -32.4 -30.6 -30.0 -34.7 -37.2 -38.0 -38.9 -39.8 -36.8 -37.5 -35.8 -30.5 2024 -30.2 -30.6 -33.2 -35.6 - - - - - - - -