1901-2000 Degrees Fahrenheit 1 19.5 24.1 -4.6 18 112 1918 2023 1920 1934 bottom-third 1968 2 22.6 26.2 -3.6 14 115 1918 2016 1920 1934 bottom-third 1943 3 28.9 30.5 -1.6 29 100 1918 2016 1934 1933 bottom-third 1994,1996 4 33.3 35.4 -2.1 17 112 1918 2023 1934 1933 bottom-third 1907,1959,1963 5 39.2 40.4 -1.2 27 102 1918 2016 1934 1933 bottom-third 1943 6 43.5 44.9 -1.4 16 113 1918 2016 1934 1933 bottom-third 1902,1959,1965 7 47.4 48.5 -1.1 21 108 1918 2023 1934 1933 bottom-third 1896,1902,1910,1940,1943,1957,1970 8 49.7 50.5 -0.8 30 99 1904 2023 1934 1933 bottom-third 1902,1907,1915,1957 9 50.7 51.0 -0.3 40 89 1918 2023 1934 1933 bottom-third 1897,1916,1943,1969,1973 10 50.1 50.4 -0.3 40 89 1918 2023 1934 1933 bottom-third 1966,1979,2001 11 48.4 48.9 -0.5 34 95 1918 2023 1934 1933 bottom-third 1929,1944,1979 12 45.5 46.9 -1.4 10 119 1918 2023 1927 1934 bottom-tenth 1902,1959,1963 18 44.7 46.2 -1.5 8 120 1905 2013 1927 1934 bottom-tenth 1904 24 46.0 46.9 -0.9 15 113 1918 2023 1928 1934 bottom-third 1897,1917,1926,1964,1969 36 46.5 46.9 -0.4 30 97 1906,1919 2023 1929 1934 bottom-third 1913,1964,1966,1969,1981 48 47.2 46.9 0.3 70 56 1905,1908,1918 2023 1931 1934 normal 1947,1961,1984,1990 60 47.3 46.9 0.4 73 52 1908 2023 1931 1934 normal 1949,1984,1985,1990,1997