1901-2000 Degrees Fahrenheit 1 58.78 59.06 -0.28 42 87 1950 2022 1974 1973 bottom-third 1978 2 59.88 59.80 0.08 55 74 1950 2022 1974 1973 normal 1913 3 58.30 58.41 -0.11 47 82 1915 2021 1974 1973 normal 4 55.68 55.67 0.01 53 76 1907 2018 1974 1970 normal 5 51.66 52.25 -0.59 21 108 1907 2012 1971 1974 bottom-third 6 47.70 48.54 -0.84 15 114 1917 2012 1971 1974 bottom-third 7 44.09 44.87 -0.78 20 109 1917 2012 1971 1974 bottom-third 8 41.31 41.73 -0.42 37 92 1917 2012 1971 1974 bottom-third 9 39.39 39.61 -0.22 46 82 1917 2012 1971 1974 normal 1955 10 38.63 38.72 -0.09 51 77 1917 2016 1971 1974 normal 1922 11 38.83 38.97 -0.14 49 79 1917 2016 1971 1974 normal 1966 12 39.70 40.04 -0.34 32 96 1917 2016 1971 1974 bottom-third 1906,1916 18 42.72 42.87 -0.15 49 79 1917 2016 1972 1974 normal 24 40.22 40.04 0.18 73 54 1918 2017 1973 1974 normal 36 40.17 40.02 0.15 67 59 1918 2017 1973 1974 normal 48 40.19 40.01 0.18 72 53 1918 2018 1974 1955 normal 60 40.02 40.00 0.02 59 65 1920 2020 1974 1974 normal 1946,1974