1901-2000 Degrees Fahrenheit 1 16.8 20.2 -3.4 26 103 1989 2015 1919 1923 bottom-third 2 25.3 26.7 -1.4 30 99 1917 2015 1921 1923 bottom-third 3 32.0 32.9 -0.9 34 95 1917 2015 1921 1923 bottom-third 1905,1968 4 37.4 38.7 -1.3 20 109 1917 2015 1919 1923 bottom-third 1896,1978,1988 5 42.5 43.6 -1.1 20 109 1904 2015 1919 1923 bottom-third 1902 6 46.3 47.3 -1.0 21 108 1904 2015 1919 1923 bottom-third 1895,1929 7 48.1 49.3 -1.2 15 114 1904 2015 1917 1923 bottom-third 1907,1972 8 48.1 49.7 -1.6 11 118 1917 2015 1917 1923 bottom-tenth 1962,1980 9 46.9 48.6 -1.7 7 122 1917 2015 1917 1923 bottom-tenth 10 45.0 46.4 -1.4 9 120 1926 2012 1917 1923 bottom-tenth 1906 11 41.8 43.7 -1.9 6 123 1917 2012 1917 1923 bottom-tenth 12 39.8 41.3 -1.5 11 118 1904 2012 1923 1922 bottom-tenth 18 42.5 43.3 -0.8 16 112 1904 2012 1923 1922 bottom-third 1903,1911,1935,1965 24 39.7 41.3 -1.6 6 122 1905 2012 1918 1923 bottom-tenth 36 40.3 41.3 -1.0 12 115 1905,1906 2012 1919 1923 bottom-tenth 1908,1928 48 41.0 41.3 -0.3 28 98 1907 2013 1920 1923 bottom-third 1911,1937,1941,1963,1964,1966,1967,1970 60 40.9 41.3 -0.4 25 100 1907 2012,2013 1921 1923 bottom-third 1903,1925,1965,1967,1972