1901-2000 Degrees Fahrenheit 1 26.58 30.68 -4.10 3 126 1911 2016 1911 1958 bottom-tenth 2 34.19 36.05 -1.86 11 118 1976 2016 1955 1958 bottom-tenth 3 40.26 41.33 -1.07 15 114 1976 2016 1955 1958 bottom-third 4 45.28 45.76 -0.48 27 102 1976 2016 1956 1958 bottom-third 1935 5 48.24 48.72 -0.48 27 102 1976 2016 1956 1958 bottom-third 6 49.69 49.87 -0.18 47 82 1976 2016 1956 1958 normal 7 49.53 49.52 0.01 53 76 1976 2016 1956 1958 normal 8 48.17 48.16 0.01 54 75 1917 2016 1956 1958 normal 9 46.05 46.14 -0.09 51 78 1917 2016 1956 1958 normal 1974 10 43.62 43.81 -0.19 48 81 1917 2016 1956 1958 normal 1944 11 41.34 41.62 -0.28 41 88 1917 2016 1956 1958 bottom-third 1942 12 39.66 40.04 -0.38 35 93 1917 2016 1956 1958 bottom-third 18 43.18 43.32 -0.14 49 79 1917 2016 1956 1958 normal 24 40.11 40.03 0.08 63 64 1917 2017 1957 1958 normal 1928 36 40.25 40.02 0.23 69 57 1918 2017 1958 1955 normal 48 40.05 40.01 0.04 60 65 1918 2018 1958 1957 normal 60 39.95 40.00 -0.05 52 72 1920 2019 1953 1958 normal 1976