1901-2000 Degrees Fahrenheit 1 45.73 47.44 -1.71 11 118 1917 2018 1924 1934 bottom-tenth 2 42.06 43.03 -0.97 21 108 1907 2012 1931 1934 bottom-third 3 38.77 38.68 0.09 62 67 1917 2012 1933 1934 normal 1914 4 35.34 34.72 0.62 89 40 1917 2012 1933 1934 top-third 1941 5 32.44 31.72 0.72 87 42 1917 2012 1933 1934 top-third 6 30.85 30.21 0.64 88 40 1917 2012 1933 1934 top-third 7 31.32 30.28 1.04 98 30 1917 2012 1933 1934 top-third 1954 8 32.81 31.68 1.13 100 28 1917 2016,2017 1933 1934 top-third 9 34.81 33.92 0.89 95 33 1917 2016 1933 1934 top-third 10 37.33 36.44 0.89 97 31 1917 2017 1933 1934 top-third 11 39.59 38.63 0.96 98 30 1917 2017 1933 1934 top-third 1974 12 41.04 40.04 1.00 101 27 1917 2017 1933 1934 top-third 18 38.05 36.76 1.29 106 21 1918 2017 1934 1935 top-third 24 41.22 40.03 1.19 108 19 1918 2017 1934 1935 top-third 36 40.61 40.02 0.59 91 35 1918 2017 1933 1934 top-third 48 40.79 40.01 0.78 98 27 1918 2018 1934 1935 top-third 2011 60 40.64 40.00 0.64 91 33 1920 2020 1934 1935 top-third