1901-2000 Degrees Fahrenheit 1 51.0 53.7 -2.7 31 98 1907 1934 1910 1912 bottom-third 2 48.6 47.5 1.1 84 45 1907 1977 1911 1912 normal 1992 3 37.9 39.9 -2.0 39 90 1899 1977 1912 1911 bottom-third 4 30.3 32.9 -2.6 28 101 1899 1977 1909 1912 bottom-third 5 24.6 27.6 -3.0 23 106 1950 1987 1912 1911 bottom-third 1920,1943 6 23.6 25.1 -1.5 37 91 1950 2012 1912 1911 bottom-third 1959,1971 7 24.6 25.3 -0.7 51 77 1979 2012 1912 1910 normal 1960 8 27.0 27.7 -0.7 53 75 1899 2012 1912 1910 normal 9 29.7 30.8 -1.1 41 87 1899 2012 1912 1911 bottom-third 1948,1967,1974 10 33.0 34.4 -1.4 29 99 1899 2012 1912 1911 bottom-third 1994 11 36.0 37.6 -1.6 27 101 1899 2012 1912 1911 bottom-third 12 38.2 39.7 -1.5 27 101 1899 2012 1912 1911 bottom-third 18 32.8 34.8 -2.0 17 110 1951 1988 1912 1911 bottom-third 24 37.4 39.7 -2.3 11 116 1917 2017 1905 1912 bottom-tenth 1898 36 37.9 39.7 -1.8 10 116 1899 2000 1905 1912 bottom-tenth 1919 48 38.5 39.6 -1.1 17 108 1899 2001 1907 1912 bottom-third 1968 60 38.5 39.6 -1.1 17 107 1920 1991,2002 1908 1912 bottom-third 1903,1921