1901-2000 Degrees Fahrenheit 1 73.7 68.5 5.2 125 4 1976 1899 1901 1899 top-tenth 2 66.5 64.4 2.1 108 21 1907 1896 1901 1899 top-third 3 61.6 60.3 1.3 90 39 1960 2012 1901 1899 top-third 4 55.3 56.4 -1.1 27 102 1960 2012 1901 1900 bottom-third 1904,1917,1923,1984,1988 5 52.0 53.4 -1.4 28 101 1940 2012 1901 1900 bottom-third 1942 6 49.8 51.7 -1.9 14 114 1978 2012 1902 1901 bottom-third 1936 7 49.0 51.6 -2.6 6 122 1940 2012 1902 1901 bottom-tenth 1904 8 50.4 52.8 -2.4 5 123 1978 2017 1902 1901 bottom-tenth 9 52.5 55.0 -2.5 4 124 1977 2017 1902 1901 bottom-tenth 1940,1968 10 54.8 57.3 -2.5 3 125 1977 2017 1902 1901 bottom-tenth 1940,1958 11 57.1 59.2 -2.1 5 123 1977 2017 1902 1901 bottom-tenth 12 58.7 60.6 -1.9 5 123 1977 2017 1902 1901 bottom-tenth 1940,1969 18 55.8 57.6 -1.8 2 125 1977 2017 1902 1901 bottom-tenth 1969,1970 24 59.6 60.6 -1.0 12 115 1969,1978 2017 1902 1901 bottom-tenth 1960 36 59.9 60.6 -0.7 17 109 1970 2018 1902 1901 bottom-third 1965,1984 48 59.9 60.6 -0.7 17 108 1971 2019,2020 1902 1901 bottom-third 1907,1960,1966 60 60.3 60.6 -0.3 30 94 1971 2020 1902 1901 bottom-third 1918,1997