1901-2000 Degrees Fahrenheit 1 25.5 27.0 -1.5 40 89 1909 1917 1919 1917 bottom-third 2 30.5 31.5 -1.0 42 87 1930 1917 1919 1917 bottom-third 1935 3 35.6 37.3 -1.7 25 104 1930 1950 1919 1918 bottom-third 1913 4 41.4 43.1 -1.7 21 108 1930 1933 1919 1918 bottom-third 1913 5 46.6 48.4 -1.8 17 112 1930 2020 1919 1918 bottom-third 1899,1923 6 50.7 52.2 -1.5 17 112 1912 2021 1919 1918 bottom-third 1993 7 52.5 53.9 -1.4 15 114 1908,1912 2021 1916 1919 bottom-third 1899,1932,1951,1968 8 52.7 54.0 -1.3 16 113 1908 2021 1916 1919 bottom-third 9 51.3 53.1 -1.8 8 121 1912 2021 1916 1919 bottom-tenth 1909 10 49.6 51.5 -1.9 5 124 1912 2012 1912 1919 bottom-tenth 1923 11 48.0 49.6 -1.6 10 119 1903 1934 1912 1919 bottom-tenth 1899,1911 12 46.1 47.6 -1.5 15 114 1898 1934 1917 1919 bottom-third 1955,1964 18 47.5 49.1 -1.6 7 121 1898,1912 1934 1917 1919 bottom-tenth 1909 24 46.4 47.5 -1.1 14 114 1898 2015,2018 1917 1919 bottom-third 1985 36 46.7 47.5 -0.8 16 111 1899 2017 1919 1916 bottom-third 1903,1909,1930,1931,1949,1984 48 46.5 47.5 -1.0 9 117 1898 2017,2018 1919 1919 bottom-tenth 1919,1932 60 46.4 47.5 -1.1 3 122 1899 2018 1917 1919 bottom-tenth 1917