1901-2000 Degrees Fahrenheit 1 43.30 41.41 1.89 110 19 1917 1947 1972 1971 top-third 1983,2005 2 47.88 46.66 1.22 106 23 1917 2015 1972 1963 top-third 3 51.74 50.79 0.95 103 26 1917 2016 1972 1963 top-third 4 53.88 53.23 0.65 91 38 1976 2021 1972 1963 top-third 5 54.32 53.71 0.61 90 39 1917 2021 1972 1963 top-third 6 52.98 52.66 0.32 76 53 1917 2018 1972 1963 normal 7 50.75 50.65 0.10 61 68 1917 2015 1972 1969 normal 8 48.70 48.07 0.63 92 37 1917 2016 1972 1963 top-third 9 45.86 45.27 0.59 85 44 1917 2016 1972 1963 normal 10 43.26 42.71 0.55 87 42 1917 2016 1972 1954 top-third 11 41.17 40.89 0.28 74 54 1917 2016 1972 1958 normal 12 40.28 40.04 0.24 74 54 1917 2016 1972 1958 normal 18 44.33 44.25 0.08 62 66 1917 2016 1972 1963 normal 24 40.17 40.04 0.13 66 61 1917,1918 2017 1972 1959 normal 36 39.99 40.02 -0.03 56 70 1918 2017 1972 1960 normal 1911 48 39.91 40.01 -0.10 47 78 1918 2018 1972 1961 normal 1945 60 39.84 40.00 -0.16 38 86 1920 2020 1972 1963 bottom-third 1910,1978