1901-2000 Degrees Fahrenheit 1 40.9 34.1 6.8 126 4 1929 1963,2015 1990 1991 top-tenth 1995 2 38.0 32.2 5.8 127 3 1937 2015 1991 1934 top-tenth 1995 3 36.7 32.1 4.6 126 3 1949 1934 1991 1934 top-tenth 4 37.3 33.5 3.8 125 4 1949 1934 1991 1934 top-tenth 5 39.8 36.4 3.4 126 3 1949 2015 1991 1934 top-tenth 6 43.5 39.9 3.6 127 2 1949 2015 1991 1992 top-tenth 7 46.8 43.3 3.5 127 2 1949 2015 1991 1992 top-tenth 8 49.2 46.0 3.2 127 2 1949 2015 1991 1992 top-tenth 9 49.7 47.2 2.5 122 7 1917,1949 2015 1991 1968 top-tenth 1968,2003 10 49.5 47.6 1.9 119 10 1917 2015 1991 1968 top-tenth 1934,1940,1941 11 48.8 47.2 1.6 111 18 1949 2015 1991 1988 top-third 2007,2019 12 47.8 46.5 1.3 106 23 1949 2015 1990 1991 top-third 2007,2017,2023 18 45.5 44.3 1.2 100 28 1917 2016 1990 1991 top-third 1967,1981,1982,2006 24 47.9 46.5 1.4 110 18 1913 2016 1991 1988 top-third 1968,1996 36 47.7 46.4 1.3 108 19 1914 2016 1991 1989 top-third 1989,1998,1999 48 47.5 46.4 1.1 100 26 1913 2018 1989 1991 top-third 1943,1994,1996,1997,2001,2002,2009 60 47.7 46.4 1.3 108 17 1913,1917 2018 1991 1991 top-third 1991,1995