1901-2000 Degrees Fahrenheit 1 38.4 28.3 10.1 125 4 1899 2012 1999 1946 top-tenth 2 31.9 22.4 9.5 127 2 1899 2012 1999 2000 top-tenth 3 26.3 19.0 7.3 125 4 1912 2012 1999 1998 top-tenth 4 25.4 18.9 6.5 122 6 1899 2012 1999 1998 top-tenth 5 28.2 21.4 6.8 124 4 1912 2012 1999 2000 top-tenth 6 31.1 25.6 5.5 123 5 1912 2012 1999 1998 top-tenth 1998 7 34.9 30.3 4.6 121 7 1912 2012 1997 1999 top-tenth 8 38.8 34.8 4.0 121 7 1912 2012 1998 1999 top-tenth 9 42.5 38.6 3.9 122 6 1904,1912 2012 1998 1999 top-tenth 2006 10 44.8 41.1 3.7 121 7 1904 2012 1999 1932 top-tenth 11 46.0 42.4 3.6 122 6 1904 2012 1998 1999 top-tenth 12 46.1 42.4 3.7 122 6 1918 2012 1998 1999 top-tenth 18 40.8 36.8 4.0 123 4 1918 2017 1998 1999 top-tenth 24 46.2 42.4 3.8 125 2 1918 2017 1999 2000 top-tenth 36 45.6 42.3 3.3 125 1 1918 2000 1999 2000 highest 48 44.6 42.3 2.3 119 6 1918 2002 1999 2000 top-tenth 2008 60 43.9 42.3 1.6 108 16 1920,1929 2002 1999 1935 top-third 1935,2005,2014