1925-2000 Degrees Fahrenheit 1 8.4 4.8 3.6 60 40 1990 2016 1994 1993 normal 2 6.7 3.5 3.2 66 34 1925 2016 1994 1993 normal 3 5.4 3.6 1.8 59 40 1965 2001 1992 1994 normal 1959,1983 4 5.8 5.6 0.2 42 57 1956 2003 1992 1994 normal 5 9.2 9.6 -0.4 36 63 1956 2003 1991 1994 normal 1955 6 14.3 14.8 -0.5 34 65 1956 2003 1993 1994 normal 1952 7 19.6 19.7 -0.1 38 61 1956 2003 1993 1994 normal 2013 8 24.0 23.9 0.1 44 55 1956 2003 1993 1994 normal 9 26.8 26.7 0.1 41 58 1956 2003 1993 1994 normal 10 28.2 27.8 0.4 47 52 1956 2003 1993 1994 normal 1960 11 27.9 27.4 0.5 51 48 1956 2016 1993 1994 normal 1948,1959 12 26.4 26.0 0.4 48 51 1956 2016 1993 1994 normal 18 23.6 22.2 1.4 68 30 1972 2016 1993 1994 top-third 1979 24 28.0 26.0 2.0 82 16 1957 2016,2017 1994 1981 top-third 36 27.2 25.9 1.3 69 28 1973,1974 2017,2018 1993 1994 top-third 1944,1945 48 27.1 25.9 1.2 68 28 1974 2019 1993 1994 top-third 1996 60 27.1 25.9 1.2 69 26 1976 2019,2020 1994 1983 top-third 1943,1996,2010