1991-2020 Degrees Fahrenheit 1 50.5 47.8 2.7 81 27 1917 1963 1913 1914 top-third 2 55.3 54.4 0.9 76 31 1917 1931 1913 1914 top-third 3 58.1 58.9 -0.8 34 72 1917 1947 1912 1914 bottom-third 1912,1969 4 60.3 61.8 -1.5 11 95 1992 1947 1915 1914 bottom-tenth 1981 5 60.5 62.9 -2.4 7 99 1992 1931 1915 1914 bottom-tenth 1985 6 59.2 62.0 -2.8 5 101 1917 1931 1915 1914 bottom-tenth 1993 7 58.5 59.6 -1.1 22 84 1917 1955 1909 1914 bottom-third 8 54.6 56.0 -1.4 21 85 1917 2012 1909 1914 bottom-third 1952,2002,2014 9 51.2 51.9 -0.7 42 64 1917 2012 1913 1914 normal 1937,1970,1994 10 47.2 48.1 -0.9 42 63 1917 2012 1913 1914 normal 1916,1920,1952,1968 11 44.0 45.6 -1.6 30 75 1917 2012 1912 1914 bottom-third 1970 12 43.3 44.6 -1.3 37 68 1917 2012 1912 1914 normal 1971,1975,1989,1992,2008 18 50.2 50.4 -0.2 59 44 1917 2012 1913 1914 normal 1947,1948,2018 24 44.9 44.6 0.3 76 26 1918 2017 1913 1914 top-third 1981,1991 36 44.6 44.6 0.0 74 26 1952 2012 1914 1915 top-third 1999 48 43.7 44.6 -0.9 40 58 1918 1934,2013 1915 1915 normal 1937,1945,1964,1993,1998 60 -99 44.6 -99 -99 -99 1969,1997 1934 normal