1901-2000 Degrees Fahrenheit 1 47.6 52.9 -5.3 13 117 1895 2018 1905 1907 bottom-tenth 2 47.5 51.6 -4.1 14 116 1978 1950 1905 1907 bottom-third 1966 3 47.8 51.4 -3.6 15 114 1978 1932 1905 1907 bottom-third 1902 4 49.7 53.0 -3.3 11 118 1977 1932 1905 1907 bottom-tenth 1958,2011 5 52.9 55.9 -3.0 12 117 1977 1932 1905 1907 bottom-tenth 1905,1963 6 57.2 59.4 -2.2 14 115 1977 1932 1904 1907 bottom-third 1915 7 60.6 62.5 -1.9 15 114 1977 1932 1905 1907 bottom-third 1915,1931 8 63.2 64.8 -1.6 14 115 1977 1932 1905 1907 bottom-third 1963 9 64.9 66.5 -1.6 13 116 1977 1932 1905 1907 bottom-tenth 1905 10 65.7 67.2 -1.5 11 118 1977 1932 1905 1907 bottom-tenth 1905,2010 11 65.4 67.1 -1.7 7 122 1977 1932,2017 1904 1907 bottom-tenth 12 65.6 66.5 -0.9 23 106 1977 2017 1905 1907 bottom-third 1896,1966,1994 18 64.0 64.1 -0.1 51 77 1978 2017 1906 1907 normal 1910,1914,1925,1983 24 66.4 66.5 -0.1 46 82 1978 2017 1906 1907 normal 1899,1940,1958,1973,2014 36 66.6 66.5 0.1 60 67 1978 2018 1907 1899 normal 1913,1926,1958,2003 48 66.2 66.5 -0.3 34 92 1970,1979,1980 2019,2020 1907 1903 bottom-third 1915,1998 60 66.0 66.5 -0.5 22 103 1970,1980,1981 2020 1906 1907 bottom-third 1904,1985