1901-2000 Degrees Fahrenheit 1 27.6 39.3 -11.7 4 126 1918 1907 1977 1978 bottom-tenth 2 34.4 40.5 -6.1 5 124 1918 1907 1977 1978 bottom-tenth 3 40.6 43.6 -3.0 11 118 1918 1932 1978 1976 bottom-tenth 1904,1970 4 45.4 48.2 -2.8 5 124 1977 1932 1977 1978 bottom-tenth 1899,1973 5 51.3 53.1 -1.8 11 118 1977 1932 1977 1978 bottom-tenth 6 56.0 57.5 -1.5 13 116 1977 1932 1977 1978 bottom-tenth 1969,1973,1993,1994 7 59.8 60.7 -0.9 24 105 1977 1932 1978 1978 bottom-third 1915,1963,1978,1994 8 61.9 62.7 -0.8 26 103 1977 1932,1999,2017 1977 1978 bottom-third 1946,1976,1994,2009 9 62.6 63.4 -0.8 26 103 1977 1999 1977 1978 bottom-third 1967,2009 10 62.6 63.1 -0.5 36 93 1977 1999 1977 1978 bottom-third 1896,1902,1925,1963,1982 11 61.2 62.0 -0.8 22 107 1918 2013 1977 1978 bottom-third 1963,1973,1985 12 58.8 60.4 -1.6 7 122 1918 2013 1977 1978 bottom-tenth 18 57.9 59.4 -1.5 5 123 1918 2017 1978 1978 bottom-tenth 1978 24 59.8 60.4 -0.6 25 103 1905,1977 2013 1978 1976 bottom-third 1903,1907,1990,2010 36 59.2 60.4 -1.2 4 123 1906 2013 1970 1978 bottom-tenth 1961 48 59.3 60.4 -1.1 5 121 1962,1980 2019,2020 1970 1978 bottom-tenth 1907,1970 60 59.5 60.4 -0.9 7 118 1980 2020 1971 1978 bottom-tenth 1908,1970,1971