1991-2020 Degrees Fahrenheit 1 71.5 67.7 3.8 110 19 1974 1925 2015 1998 top-third 2 74.2 71.0 3.2 121 8 1967 1936 2015 2007 top-tenth 2002,2005 3 75.0 72.4 2.6 119 10 1967 1936 2015 2007 top-tenth 1954,2007 4 74.6 72.3 2.3 117 12 1974 1936 2015 2010 top-tenth 1919,2007 5 71.9 70.6 1.3 96 33 1967 1936 2015 2010 top-third 1908 6 69.1 68.0 1.1 104 25 1976 1936,2010 2015 2010 top-third 1914,1933,1959 7 66.5 64.6 1.9 122 7 1950 1921 2015 2012 top-tenth 1922 8 62.7 61.0 1.7 123 6 1958 1921 2015 2012 top-tenth 1938 9 59.1 57.8 1.3 116 13 1978 1921 2015 2012 top-tenth 1953 10 57.9 55.7 2.2 125 3 1978 1921,2012 2015 2012 top-tenth 11 57.1 54.7 2.4 126 2 1978 2012 2015 2012 top-tenth 12 57.0 54.8 2.2 125 3 1978 1921 2015 2012 top-tenth 2017 18 60.6 59.2 1.4 123 5 1968 2017 2015 2012 top-tenth 2002 24 54.9 54.8 0.1 97 30 1979 2017 2015 2013 top-third 1942,1992,2003 36 54.3 54.7 -0.4 67 59 1979 2018 2015 2014 normal 1902,1931,1937,1938,1949,1991 48 54.2 54.7 -0.5 67 58 1979,1980,1981 2019 1999 2015 normal 1902,1910,1915,1930,1941,1947,1950,1953,1991,1992 60 54.8 54.7 0.1 103 21 1981,1982 2020 2015 2013 top-third 1922,1924,1955,1957,2007,2011,2013,2017