Davis 12Z temperature 1957 - - -7.3 -9.3 -14.3 -11.8 -17.5 -15.0 -15.0 -7.2 -4.9 0.6 1958 0.9 -2.5 -6.3 -11.4 -13.2 -16.5 -14.8 -19.0 -17.2 -11.8 -4.9 0.6 1959 -0.7 -2.9 -4.2 -11.4 -12.6 -16.9 -17.2 -16.3 -18.7 -9.7 -4.6 0.5 1960 0.8 -1.2 -9.9 -14.2 -16.9 -19.6 -22.8 -17.4 -15.4 -10.9 -3.2 0.1 1961 1.4 1.0 -5.3 -9.4 -11.7 -15.4 -13.2 -15.6 -11.2 -10.6 -3.8 -0.8 1962 -0.6 -1.1 -8.2 -14.4 -19.0 -16.3 -19.4 -21.4 -16.5 -11.1 -4.0 0.1 1963 1.2 -2.8 -8.3 -14.0 -16.1 -14.7 -17.2 -13.4 -13.8 -12.1 -3.9 0.1 1964 1.1 -0.6 -8.0 -16.1 -17.9 -13.6 -17.3 -14.8 -20.1 -11.1 - - 1965 - - - - - - - - - - - - 1966 - - - - - - - - - - - - 1967 - - - - - - - - - - - - 1968 - - - - - - - - - - - - 1969 - - -6.5 -12.0 -16.8 -15.1 -18.3 -22.2 -16.6 -10.6 -4.5 1.9 1970 0.8 -2.0 -5.3 -11.8 -11.3 -16.7 -17.7 -16.8 -14.6 -11.2 -3.3 1.7 1971 2.3 -0.9 -7.1 -14.1 -13.4 -17.9 -16.1 -14.4 -13.8 -9.1 -4.3 2.4 1972 3.7 -1.0 -5.6 -11.2 -19.2 -13.4 -18.5 -12.4 -15.7 -13.7 -3.8 -0.2 1973 1.6 -1.7 -10.1 -13.3 -14.6 -12.7 -20.8 -17.7 -11.3 -8.8 -2.2 -0.4 1974 2.7 -1.4 -7.7 -12.0 -16.5 -13.0 -15.4 -13.8 -17.0 -6.0 -1.7 2.6 1975 3.3 -1.8 -8.7 -14.2 -12.0 -14.3 -18.3 -19.6 -17.7 -10.6 -2.0 0.5 1976 2.4 -1.2 -8.8 -13.2 -20.2 -14.4 -16.5 -21.2 -17.9 -8.2 -3.1 2.1 1977 3.7 -1.3 -8.6 -12.8 -14.7 -15.1 -17.5 -15.7 -20.2 -13.3 -5.7 0.1 1978 0.4 -1.3 -5.4 -10.9 -14.9 -13.5 -16.4 -21.8 -16.2 -15.1 -3.5 1.0 1979 1.1 -2.4 -8.3 -11.8 -15.5 -17.7 -20.2 -17.4 -14.2 -10.9 -4.1 1.5 1980 1.6 -2.6 -4.8 -9.6 -19.2 -19.7 -11.9 -17.2 -12.9 -11.0 -1.1 1.1 1981 1.6 -2.0 -6.6 -16.7 -16.3 -16.6 -16.1 -12.2 -14.1 -13.2 -3.6 0.4 1982 1.1 -1.7 -11.5 -17.4 -15.6 -22.6 -15.9 -25.2 -22.2 -10.9 -3.4 1.7 1983 2.7 -1.1 -7.1 -10.5 -13.3 -15.4 -20.7 -16.3 -12.1 -12.3 -6.4 -0.6 1984 2.6 -1.6 -6.6 -10.5 -14.1 -17.5 -18.9 -15.5 -13.5 -14.0 -4.5 2.1 1985 2.4 -2.5 -6.2 -10.8 -15.1 -13.9 -24.8 -17.5 -16.3 -11.6 -4.9 -0.4 1986 0.6 2.2 -5.9 -12.2 -11.8 -18.3 -19.1 -18.6 -14.2 -10.1 -4.4 -0.1 1987 2.0 -1.4 -7.7 -13.8 -18.0 -14.8 -13.5 -19.3 -17.8 -10.3 -4.0 1.1 1988 1.8 -2.0 -4.5 -12.5 -11.3 -12.4 -18.1 -14.7 -12.9 -7.3 -4.6 -0.5 1989 1.5 -1.9 -9.5 -14.5 -20.4 -14.3 -19.1 -13.2 -10.7 -8.2 -6.0 2.2 1990 2.1 -2.0 -7.6 -8.7 -12.4 -16.0 -16.6 -15.7 -16.7 -10.9 -2.6 1.5 1991 0.3 -0.5 -5.8 -7.9 -13.9 -11.3 -10.9 -14.4 -16.4 -9.9 -3.2 3.3 1992 2.3 0.1 -6.6 -17.4 -17.7 -17.2 -20.8 -18.3 -19.5 -10.1 -3.3 -0.5 1993 2.2 -1.2 -7.0 -13.6 -20.4 -18.0 -22.3 -21.7 -19.5 -11.3 -4.5 0.0 1994 0.7 -1.5 -7.8 -14.1 -19.5 -11.0 -15.7 -19.9 -11.3 -8.4 -3.4 0.5 1995 0.8 -1.7 -5.8 -13.7 -16.6 -16.3 -7.0 -17.2 -15.7 -12.2 -2.9 0.7 1996 2.3 -0.6 -6.8 -11.7 -17.2 -14.0 -17.5 -13.2 -12.7 -10.5 -2.5 0.8 1997 1.0 -1.2 -5.1 -14.6 -16.6 -14.5 -16.3 -18.7 -17.5 -10.6 -3.4 1.6 1998 1.1 -1.0 -8.3 -20.6 -16.2 -15.6 -19.3 -12.9 -16.1 -11.5 -2.5 1.2 1999 1.0 -1.4 -8.2 -13.9 -17.8 -14.0 -19.5 -16.7 -16.1 -9.0 -6.1 -1.1 2000 0.2 -1.9 -6.3 -9.8 -17.0 -15.8 -15.6 -14.6 -13.2 -13.9 -1.3 1.2 2001 2.2 -1.4 -6.3 -12.6 -13.1 -16.8 -15.7 -19.7 -15.5 -10.4 -2.6 -0.1 2002 1.8 -2.2 -5.4 -10.7 -10.7 -13.4 -14.9 -19.3 -14.0 -8.6 -3.0 0.3 2003 2.4 0.8 -5.3 -12.7 -16.9 -14.6 -19.6 -17.7 -13.2 -10.0 -3.5 2.0 2004 2.4 0.5 -6.8 -13.4 -13.6 -17.8 -21.0 -15.1 -16.3 -8.9 -2.9 2.8 2005 2.9 -1.2 -5.4 -15.1 -17.3 -15.1 -20.2 -19.5 -14.4 -9.8 -3.4 2.9 2006 1.8 -1.9 -5.9 -8.2 -19.3 -14.9 -19.9 -14.5 -14.5 -11.3 -2.8 0.6 2007 1.7 -0.3 -6.5 -10.3 -9.9 -13.6 -11.4 -13.6 -14.7 -10.4 -1.5 -0.1 2008 0.4 -1.7 -7.0 -11.4 -13.2 -17.0 -16.1 -22.5 -19.2 -13.1 -3.7 1.3 2009 1.9 -1.0 -6.6 -12.9 -13.5 -15.1 -14.2 -18.9 -12.4 -9.9 -3.3 0.2 2010 3.2 -0.9 -5.8 -15.0 -15.3 -14.5 -21.0 -19.3 -10.8 -11.0 -5.1 0.5 2011 1.8 -3.7 -6.0 -12.6 -16.6 -18.6 -12.7 -14.8 -13.5 -12.7 -3.1 0.4 2012 1.3 -1.1 -7.3 -11.2 -17.3 -14.7 -21.1 -19.0 -15.2 -8.0 -1.6 1.3 2013 2.1 -1.3 -11.4 -15.6 -16.4 -15.5 -15.8 -18.6 -10.2 -8.8 -3.0 0.4 2014 2.9 -0.8 -9.2 -15.6 -11.5 -20.1 -19.9 -16.5 -11.9 -8.6 -1.6 0.8 2015 1.2 -0.8 -6.9 -15.8 -23.1 -15.6 -22.0 -17.1 -14.7 -11.6 -3.5 0.9 2016 0.9 -2.2 -9.8 -14.1 -16.5 -20.8 -19.0 -16.3 -19.5 -9.7 -0.8 2.3 2017 2.4 -1.0 -7.3 -15.9 -13.6 -19.8 -16.4 -17.2 -17.9 -12.1 -2.6 0.2 2018 1.9 -1.0 -7.6 -9.7 -14.4 -14.0 -13.8 -12.3 -16.3 -9.9 -5.5 1.3 2019 1.5 0.0 -6.4 -13.2 -18.4 -17.1 -18.5 -13.9 -14.8 -10.5 -2.0 0.8 2020 2.3 -1.3 -10.5 -12.3 -14.1 -14.4 -14.7 -13.9 -12.3 -9.5 -2.3 -0.4 2021 0.7 -1.6 -6.1 -11.8 -16.5 -18.6 -15.4 -13.3 -13.9 -7.2 -5.2 0.9 2022 1.5 -0.8 -6.4 -12.7 -15.6 -11.1 -16.5 -15.3 -14.5 -8.3 -5.2 0.5 2023 0.4 -1.0 -6.5 -9.8 -19.1 -14.4 -21.4 -23.8 -12.0 -10.4 -3.9 0.2 2024 1.5 -1.8 -6.3 -15.0 - - - - - - - -