1901-2000 Degrees Fahrenheit 1 40.1 44.6 -4.5 17 113 1940 1974 1981 1980 bottom-third 2 41.1 45.2 -4.1 11 118 1918 1932 1978 1981 bottom-tenth 1978 3 44.9 47.8 -2.9 15 114 1918 1932 1981 1980 bottom-third 1931,1948 4 48.9 51.7 -2.8 9 120 1918 1932 1981 1980 bottom-tenth 5 53.4 56.1 -2.7 5 124 1918 1932 1977 1981 bottom-tenth 1902,1968 6 57.2 59.9 -2.7 4 125 1977 1932 1977 1981 bottom-tenth 1904 7 60.6 62.7 -2.1 6 123 1977 1932 1977 1981 bottom-tenth 8 63.1 64.5 -1.4 10 119 1977 1932 1977 1981 bottom-tenth 9 63.6 65.2 -1.6 7 122 1977 1932 1977 1981 bottom-tenth 10 63.9 64.8 -0.9 17 112 1977 2017 1977 1981 bottom-third 1963,2001 11 62.7 63.8 -1.1 11 118 1918 2017 1977 1981 bottom-tenth 1938,1948,1964,1967 12 61.3 62.4 -1.1 14 115 1918 2017 1977 1981 bottom-third 1904,1915,1925,1938 18 60.5 61.6 -1.1 11 117 1905 2017 1978 1981 bottom-tenth 1941,1961,1965,1967 24 61.4 62.4 -1.0 9 119 1970 2017,2020 1978 1981 bottom-tenth 1919,1965,1977,1978 36 61.5 62.4 -0.9 9 118 1970 2019,2021 1979 1981 bottom-tenth 1906,1961,1964,1965,1966,1979 48 61.6 62.4 -0.8 10 116 1970 2020 1980 1981 bottom-tenth 1962,1965,1980 60 61.8 62.4 -0.6 18 107 1970 2020,2021 1981 1980 bottom-third 1962,1980,1983,1985