1991-2020 Degrees Fahrenheit 1 62.7 59.7 3.0 76 9 1988 2007 1983 1971 top-third 2 64.5 65.2 -0.7 44 40 1981 2007 1982 1983 normal 3 68.6 69.4 -0.8 47 37 1940 2016,2021 1982 1983 normal 2011 4 70.0 71.9 -1.9 29 55 1940 2016 1982 1983 normal 1996 5 70.9 72.1 -1.2 35 49 1940 2010 1982 1983 normal 1989 6 69.4 70.8 -1.4 35 49 1940 2010 1982 1983 normal 1942,1951 7 66.7 68.3 -1.6 28 56 1940 2010 1982 1983 bottom-third 1986,1996,2000 8 62.9 65.2 -2.3 11 73 1940 2010 1982 1983 bottom-third 9 60.3 62.0 -1.7 25 59 1940 2010,2012 1982 1983 bottom-third 1944,1986,1987,1996 10 57.3 59.2 -1.9 22 62 1940 2012 1982 1983 bottom-third 1968,1981,1988 11 55.3 57.5 -2.2 19 65 1940 2016 1982 1983 bottom-third 1964,1972,2014 12 54.8 56.8 -2.0 25 59 1940 2016 1982 1983 bottom-third 1944 18 59.8 61.4 -1.6 29 54 1978 2016 1982 1983 normal 1950,1951,1961,1972,2003 24 55.6 56.8 -1.2 48 35 1978 2017 1983 1976 normal 1986 36 55.0 56.7 -1.7 26 56 1979 2018 1983 1977 bottom-third 1960 48 54.7 56.7 -2.0 14 67 1943 2019 1982 1983 bottom-third 1945,1947,1967,1968,1978 60 54.9 56.7 -1.8 21 59 1944,1981,1982 2020 1983 1983 bottom-third 1960,1962,1983