1901-2000 Degrees Fahrenheit 1 20.7 34.1 -13.4 2 128 1933 1995,2015 1903 1902 bottom-tenth 2 26.5 32.1 -5.6 8 122 1949 2015 1903 1902 bottom-tenth 3 28.4 31.7 -3.3 15 114 1949 2015 1903 1902 bottom-third 4 30.5 33.6 -3.1 10 119 1949 2015 1903 1902 bottom-tenth 1929 5 34.6 37.0 -2.4 13 116 1949 2015 1903 1902 bottom-tenth 1939 6 39.1 41.1 -2.0 15 114 1949 2015 1903 1902 bottom-third 1952 7 43.3 45.2 -1.9 12 117 1949 2015 1903 1902 bottom-tenth 1979 8 46.4 48.6 -2.2 7 122 1949 2015 1903 1902 bottom-tenth 9 48.6 50.3 -1.7 9 120 1949 2015 1903 1902 bottom-tenth 1985 10 49.2 50.8 -1.6 10 119 1917 2015 1903 1902 bottom-tenth 1906,1912 11 48.9 50.4 -1.5 10 119 1949 2015 1903 1902 bottom-tenth 12 47.8 49.5 -1.7 6 123 1949 2015 1903 1902 bottom-tenth 18 46.0 46.7 -0.7 21 107 1949 2016 1899 1902 bottom-third 1899,1924,1942,1966 24 48.9 49.5 -0.6 26 102 1913 2016 1899 1902 bottom-third 1908,1943,1965 36 49.1 49.5 -0.4 31 96 1914 2016,2017 1900 1902 bottom-third 1911,1916,1945,1956,1972 48 49.2 49.5 -0.3 40 86 1915,1949 2018 1901 1902 bottom-third 1905,1907,1934,1955,1975,1985 60 49.2 49.4 -0.2 36 89 1917,1949 2018 1901 1902 bottom-third 1926,1958,1972,1974