1901-2000 Degrees Fahrenheit 1 0.8 9.8 -9.0 10 120 1936 1998 1979 1988 bottom-tenth 2 5.7 7.0 -1.3 50 80 1936 1987 1982 1988 normal 3 8.2 8.3 -0.1 64 65 1936 1998 1985 1988 normal 1900,1970 4 12.7 12.7 0.0 63 66 1936 2002 1986 1988 normal 1957 5 18.3 18.8 -0.5 53 76 1936 2012 1986 1988 normal 1934,1970,1985 6 24.5 24.9 -0.4 54 75 1936 2016 1986 1988 normal 1901,1905,1974 7 30.7 30.7 0.0 57 72 1936 2012,2016 1986 1988 normal 1909 8 35.8 35.4 0.4 68 61 1936 2012 1986 1988 normal 1900,1963 9 39.7 38.4 1.3 86 43 1936 2012,2016 1986 1988 top-third 1935,1945 10 41.8 39.9 1.9 100 29 1936 2002 1986 1988 top-third 1935,1944 11 41.8 39.9 1.9 104 25 1936 2002,2016 1986 1988 top-third 1944,1983 12 40.6 38.5 2.1 107 22 1936 2016 1986 1988 top-third 2011 18 36.1 34.0 2.1 107 21 1918 2017 1987 1988 top-third 1981,2011,2021 24 41.1 38.5 2.6 115 13 1918 2017 1987 1988 top-tenth 1992 36 41.3 38.5 2.8 120 7 1918 2018 1988 1989 top-tenth 2007 48 40.5 38.4 2.1 115 11 1900,1918,1920 2002 1988 1989 top-tenth 1991,2009 60 40.0 38.4 1.6 103 22 1920 2002 1988 1935 top-third 1993