1901-2000 Degrees Fahrenheit 1 32.92 33.82 -0.90 51 79 1936 1954 1967 1963 normal 2 30.93 31.97 -1.04 36 94 1979 2017 1966 1967 bottom-third 3 31.31 32.23 -0.92 36 93 1979 2016 1966 1967 bottom-third 4 33.87 34.60 -0.73 36 93 1979 2000 1964 1967 bottom-third 5 37.88 38.51 -0.63 34 95 1899 2017 1962 1967 bottom-third 6 42.24 42.90 -0.66 30 99 1899 2016 1962 1967 bottom-third 7 46.38 47.07 -0.69 25 104 1899 2017 1962 1967 bottom-third 8 49.65 50.39 -0.74 25 104 1899 2017 1962 1967 bottom-third 9 51.64 52.40 -0.76 20 109 1977 2017 1936 1967 bottom-third 10 52.24 53.18 -0.94 16 113 1918,1977 2017 1936 1967 bottom-third 11 52.13 52.98 -0.85 17 112 1918 2017 1936 1967 bottom-third 12 51.42 52.02 -0.60 25 104 1918 2017 1966 1967 bottom-third 18 48.68 48.97 -0.29 39 89 1918 2017 1966 1967 bottom-third 24 51.80 52.01 -0.21 40 88 1918 2017 1967 1965 bottom-third 36 51.58 52.00 -0.42 21 106 1918 2018 1930 1967 bottom-third 48 51.62 51.99 -0.37 23 103 1918 2019 1921 1967 bottom-third 1970 60 51.83 51.98 -0.15 41 84 1918 2020 1966 1967 bottom-third 1911