1901-2000 Degrees Fahrenheit 1 47.4 52.3 -4.9 9 121 1960 2012 1914 1913 bottom-tenth 2 45.3 48.7 -3.4 17 113 1947 2012 1912 1913 bottom-third 1924 3 44.6 46.6 -2.0 33 97 1978 2023 1912 1913 bottom-third 1904,1931,1985 4 44.4 45.8 -1.4 34 95 1978 2012,2023 1912 1913 bottom-third 5 46.0 46.8 -0.8 39 90 1977 2012,2017,2023 1912 1913 bottom-third 6 48.0 49.2 -1.2 31 98 1977 2017 1912 1913 bottom-third 1912,1936,1941 7 51.1 52.5 -1.4 24 105 1977 2017 1905 1913 bottom-third 2001 8 54.4 55.6 -1.2 23 106 1977 2017 1906 1913 bottom-third 1900,1984 9 57.1 58.0 -0.9 26 103 1977 2017 1906 1913 bottom-third 1947,1960,1965 10 58.9 59.7 -0.8 30 99 1977 2017 1906 1913 bottom-third 1971,1993 11 59.8 60.5 -0.7 30 99 1977 2017 1905 1913 bottom-third 1924,1931,1971,1973 12 59.7 60.5 -0.8 26 103 1977 2017 1908 1913 bottom-third 1908,1975 18 56.5 56.7 -0.2 39 89 1978 2017 1906 1913 bottom-third 1972,1993,1997 24 60.3 60.5 -0.2 42 86 1978 2017 1906 1913 bottom-third 1904,1942,1951,1958,1996 36 60.4 60.5 -0.1 41 86 1970 2018 1907 1913 bottom-third 1907,1919,1931,1975,1994 48 60.5 60.5 0.0 42 84 1970 2020 1908 1913 bottom-third 1948,1958,1975,1997 60 60.5 60.5 0.0 44 81 1970 2020 1908 1913 normal 1942,1951,1955,1958,1976