1901-2000 Degrees Fahrenheit 1 17.9 21.7 -3.8 21 108 1989 2015 1919 1923 bottom-third 2 26.0 28.0 -2.0 24 105 1917 2015 1921 1923 bottom-third 1945 3 32.5 33.9 -1.4 23 106 1917 2015 1921 1923 bottom-third 1934 4 37.9 39.6 -1.7 16 113 1917 2015 1919 1923 bottom-third 1906 5 43.0 44.5 -1.5 16 113 1904 2015 1919 1923 bottom-third 1972 6 46.8 48.1 -1.3 14 115 1904 2015 1919 1923 bottom-third 1919,1964,1980 7 48.6 50.0 -1.4 14 115 1904 2021 1917 1923 bottom-third 1914 8 48.6 50.4 -1.8 6 123 1917 2015 1917 1923 bottom-tenth 1902,1910,1925 9 47.5 49.3 -1.8 6 123 1917 2015,2021 1917 1923 bottom-tenth 1958 10 45.7 47.3 -1.6 6 123 1917 2012 1917 1923 bottom-tenth 1906,1940 11 42.7 44.6 -1.9 5 124 1917 2012 1917 1923 bottom-tenth 1914 12 40.7 42.3 -1.6 8 121 1904 2012 1917 1923 bottom-tenth 18 43.3 44.3 -1.0 13 115 1904 2012 1923 1922 bottom-tenth 1963 24 40.7 42.3 -1.6 6 122 1905 2021 1918 1923 bottom-tenth 1907 36 41.2 42.3 -1.1 10 117 1905,1906 2012,2022 1919 1923 bottom-tenth 1908,1909,1927 48 41.8 42.3 -0.5 22 104 1907 2013 1920 1923 bottom-third 1902,1943,1968 60 41.7 42.3 -0.6 18 107 1907 2014,2022 1921 1923 bottom-third 1903