1901-2000 Degrees Fahrenheit 1 46.6 45.3 1.3 81 49 1903 2015 1994 1996 normal 1967,2018 2 45.6 43.9 1.7 93 37 1949 2015 1994 1996 top-third 1988,2005 3 45.6 43.6 2.0 106 23 1949 2015 1994 1996 top-third 1958,1984 4 47.0 45.1 1.9 109 20 1949 2015 1995 1996 top-third 1992,2009 5 49.4 48.0 1.4 103 26 1949 2015 1995 1996 top-third 1941 6 52.6 51.4 1.2 96 33 1917,1949 2015 1995 1996 top-third 1918,1953,1977,1988,1991,2010,2017 7 56.0 54.6 1.4 102 27 1917 2015 1995 1996 top-third 1938,1951,1984,2004,2017 8 58.8 57.1 1.7 110 19 1917 2015 1995 1996 top-third 1940,2002,2004,2013 9 60.1 58.3 1.8 113 16 1917 2015 1995 1996 top-third 1978,2023 10 60.3 58.6 1.7 113 16 1917 2015 1995 1996 top-third 2007,2023 11 60.0 58.1 1.9 117 12 1949 2015 1996 1997 top-tenth 2013,2020 12 59.3 57.4 1.9 117 12 1949 2015 1996 1997 top-tenth 2003 18 57.9 55.4 2.5 122 6 1913,1949 2015 1996 1997 top-tenth 2014 24 59.0 57.4 1.6 113 15 1913 2015,2016 1996 1941 top-third 1941,2004,2005 36 58.9 57.4 1.5 111 16 1914 2016 1996 1997 top-third 2006 48 58.7 57.4 1.3 109 17 1913 2018 1996 1997 top-third 2007,2008,2014 60 58.7 57.3 1.4 109 16 1913 2018 1996 1997 top-third 1998,2008,2014