1901-2000 Degrees Fahrenheit 1 41.13 38.61 2.52 121 9 1920 1981 1953 1946 top-tenth 2 34.45 34.30 0.15 66 64 1950 2012 1952 1953 normal 3 32.63 30.47 2.16 110 20 1899 2012 1953 1946 top-third 4 29.49 27.79 1.70 103 27 1912 2012 1952 1953 top-third 5 28.27 26.76 1.51 103 26 1899 2012 1952 1953 top-third 6 28.92 27.42 1.50 107 22 1899 2017 1953 1938 top-third 7 30.80 29.42 1.38 106 23 1899 2017 1953 1938 top-third 8 33.32 32.23 1.09 97 32 1917 2016 1953 1938 top-third 9 36.13 35.21 0.92 95 34 1917 2017 1953 1938 top-third 10 38.61 37.74 0.87 95 34 1917 2017 1953 1938 top-third 2011 11 40.28 39.37 0.91 95 34 1917 2017 1953 1938 top-third 12 40.84 40.04 0.80 96 33 1917 2016 1953 1938 top-third 18 36.78 35.83 0.95 100 28 1918 2017 1953 1935 top-third 24 40.64 40.03 0.61 91 37 1918 2017 1953 1942 top-third 36 40.26 40.02 0.24 72 55 1918 2017 1953 1943 normal 1976 48 39.99 40.01 -0.02 54 72 1918 2019 1953 1948 normal 60 39.97 40.00 -0.03 56 69 1920 2020 1953 1946 normal 1960