1901-2000 Degrees Fahrenheit 1 28.2 34.1 -5.9 7 123 1929 1963,2015 1911 1921 bottom-tenth 1936 2 24.9 32.2 -7.3 4 126 1937 2015 1922 1921 bottom-tenth 3 26.5 32.1 -5.6 4 125 1949 1934 1922 1921 bottom-tenth 4 29.7 33.5 -3.8 7 122 1949 1934 1917 1921 bottom-tenth 5 33.7 36.4 -2.7 11 118 1949 2015 1920 1921 bottom-tenth 6 36.8 39.9 -3.1 5 124 1949 2015 1917 1921 bottom-tenth 1937 7 40.6 43.3 -2.7 5 124 1949 2015 1917 1921 bottom-tenth 8 43.5 46.0 -2.5 4 125 1949 2015 1917 1921 bottom-tenth 1910 9 45.1 47.2 -2.1 6 123 1917,1949 2015 1917 1921 bottom-tenth 10 45.6 47.6 -2.0 5 124 1917 2015 1917 1921 bottom-tenth 1903,1979 11 45.2 47.2 -2.0 5 124 1949 2015 1917 1921 bottom-tenth 1903 12 44.8 46.5 -1.7 8 121 1949 2015 1917 1921 bottom-tenth 18 42.9 44.3 -1.4 14 114 1917 2016 1921 1920 bottom-third 24 45.1 46.5 -1.4 11 117 1913 2016 1918 1921 bottom-tenth 1897,1949 36 45.1 46.4 -1.3 2 125 1914 2016 1914 1921 bottom-tenth 1900,1913,1923 48 45.4 46.4 -1.0 9 117 1913 2018 1920 1921 bottom-tenth 1901,1912,1916,1920,1924 60 45.6 46.4 -0.8 16 109 1913,1917 2018 1921 1919 bottom-third 1906,1912,1918