1901-2000 Degrees Fahrenheit 1 49.2 51.2 -2.0 39 91 1978 2018 1895 1897 bottom-third 1983 2 50.4 49.8 0.6 76 54 1978 1950 1897 1898 normal 3 50.4 49.7 0.7 77 52 1978 1932 1897 1898 normal 1945,1956 4 52.0 51.3 0.7 76 53 1977 1932 1896 1897 normal 5 55.4 54.2 1.2 93 36 1977 1932 1897 1898 top-third 1939,1943 6 59.0 57.8 1.2 98 31 1977 1932 1897 1898 top-third 2012 7 62.0 61.0 1.0 95 34 1977 1932 1896 1897 top-third 1917,1939 8 64.7 63.5 1.2 98 31 1977 1932 1896 1897 top-third 1909,1991,2008 9 66.6 65.2 1.4 107 22 1977 1932 1897 1898 top-third 1925,1949,1974 10 67.0 65.9 1.1 103 26 1977 1932 1896 1897 top-third 1974 11 66.8 65.8 1.0 102 27 1977 1932,2017 1896 1897 top-third 1906,1913,1926,2018 12 66.6 65.1 1.5 108 21 1977 2017 1896 1897 top-third 18 64.0 62.7 1.3 114 14 1977,1978 2017 1897 1898 top-third 1999 24 66.8 65.1 1.7 118 10 1978 2017 1897 1898 top-tenth 36 66.2 65.1 1.1 115 12 1970,1978 2021 1898 1898 top-tenth 1924,1950,2013 48 -99 65.1 -99 -99 -99 1970 2020 normal 60 -99 65.1 -99 -99 -99 1970,1971 2020,2021 normal