1991-2020 Degrees Fahrenheit 1 43.5 45.0 -1.5 91 34 1917 2017 1998 1999 top-third 2 41.6 40.1 1.5 115 10 1933 2017 1998 1999 top-tenth 2009 3 38.7 36.1 2.6 118 7 1917 2015 1998 1999 top-tenth 4 36.6 34.2 2.4 117 7 1917 2015 1999 1995 top-tenth 5 37.9 35.3 2.6 119 5 1917 2017 1999 1986 top-tenth 1986 6 40.7 38.3 2.4 121 3 1917 2017 1999 2000 top-tenth 7 43.9 42.4 1.5 118 6 1917 2017 1998 1999 top-tenth 8 47.7 46.6 1.1 115 9 1917 2017 1998 1999 top-tenth 9 51.0 50.2 0.8 116 8 1917 2017 1998 1999 top-tenth 1981,1996 10 53.0 52.5 0.5 112 12 1917 2017 1998 1999 top-tenth 2009,2021 11 53.5 53.4 0.1 106 18 1917 2017 1998 1999 top-third 1997,2009 12 53.0 53.3 -0.3 98 26 1913,1917 2017 1998 1999 top-third 2011 18 48.7 48.3 0.4 111 12 1913 2018 1999 1997 top-tenth 2006,2015 24 53.4 53.3 0.1 105 18 1913 2018 1999 1996 top-third 36 53.1 53.2 -0.1 101 21 1914 2019 1998 1999 top-third 2008 48 53.1 53.2 -0.1 101 20 1920 2018 1999 1998 top-third 2009 60 53.0 53.1 -0.1 100 20 1917 2019 1998 1999 top-third 1997