1901-2000 Degrees Fahrenheit 1 75.04 73.61 1.43 106 23 1915 1936 1929 1901 top-third 2 71.73 71.05 0.68 84 45 1915 2021 1929 1925 normal 1949 3 67.56 67.43 0.13 59 70 1907 2018 1929 1925 normal 1999 4 64.27 63.34 0.93 99 30 1907 1934 1929 1925 top-third 1952,1954 5 59.50 58.97 0.53 84 45 1917 2012 1929 1925 normal 6 56.27 54.78 1.49 112 17 1917 2012 1929 1925 top-third 7 51.59 51.26 0.33 77 52 1912 2012 1929 1927 normal 8 49.39 48.94 0.45 80 48 1917 2012 1929 1925 normal 1989 9 48.17 48.14 0.03 57 71 1912 2012 1929 1927 normal 1955 10 48.74 48.74 0.00 57 71 1917 2012 1929 1927 normal 11 50.08 50.20 -0.12 49 79 1917 2012 1929 1928 normal 12 51.96 52.03 -0.07 52 76 1917 2012 1929 1927 normal 18 52.50 52.94 -0.44 25 103 1917 2017 1929 1928 bottom-third 1948,1971 24 51.50 52.02 -0.52 19 108 1913 2017 1929 1928 bottom-third 36 51.59 52.00 -0.41 20 106 1917 2018 1920 1929 bottom-third 48 51.74 51.99 -0.25 30 95 1918 2018 1929 1928 bottom-third 1965 60 51.73 51.98 -0.25 27 97 1920 2020 1921 1929 bottom-third