1901-2000 Degrees Fahrenheit 1 34.3 29.0 5.3 116 14 1899 1930 1997 1999 top-third 2 31.2 27.1 4.1 119 11 1905 1932,1998,2017 1997 1999 top-tenth 1911,1990 3 30.9 27.3 3.6 120 9 1899 1932 1997 1999 top-tenth 1921,1938 4 33.6 29.6 4.0 124 5 1899 1932 1998 1999 top-tenth 5 36.3 33.4 2.9 123 6 1899 1932 1998 1999 top-tenth 1935,1995 6 39.9 37.9 2.0 117 12 1899 1932 1997 1999 top-tenth 1935 7 44.1 42.3 1.8 118 11 1899 1932 1998 1999 top-tenth 1998 8 47.4 45.7 1.7 117 12 1899 1932 1998 1999 top-tenth 2020 9 49.4 47.9 1.5 118 11 1977 1932 1998 1999 top-tenth 1931 10 50.0 48.7 1.3 112 17 1977 1999 1998 1999 top-third 1915,1937,2002,2020 11 49.9 48.6 1.3 112 17 1918 1999 1998 1999 top-third 1942,1957 12 48.8 47.6 1.2 111 18 1918 2017 1998 1999 top-third 1926,1931,1937,1939,1957 18 46.8 44.4 2.4 125 3 1918 2017 1998 1999 top-tenth 24 49.6 47.6 2.0 125 3 1918 2017 1999 2000 top-tenth 36 49.1 47.6 1.5 122 5 1918 2018 1999 2000 top-tenth 48 48.6 47.5 1.1 115 11 1905,1980 2019 1999 1940 top-tenth 1938,1940,2007 60 48.2 47.5 0.7 95 30 1980 2020 1999 1958 top-third 1924,1932,1943,1945,1957,2004,2014,2015