1991-2020 Degrees Fahrenheit 1 53.9 53.3 0.6 94 30 1919 2015 2007 2005 top-third 2 60.3 60.2 0.1 94 30 1912 2015 2007 2007 top-third 2007 3 65.8 65.6 0.2 104 20 1912 2015 2006 2007 top-third 2021 4 69.5 69.0 0.5 108 16 1912 2003 2006 2007 top-third 1994 5 69.9 69.8 0.1 104 20 1912 2018 2006 2007 top-third 2011 6 68.0 68.5 -0.5 101 23 1912 2018 2006 2007 top-third 1990,2006 7 65.3 66.2 -0.9 92 32 1912 2012,2018 1999 2007 top-third 2019 8 62.3 63.5 -1.2 89 35 1912 2012 1999 2007 top-third 1940,1981 9 58.9 60.4 -1.5 87 37 1917 2012 1997 2007 top-third 1963 10 55.2 57.1 -1.9 78 46 1917 2012 1991 2007 normal 1987 11 52.5 54.5 -2.0 76 47 1917 2015 1993 2007 normal 1959,1993 12 51.6 53.3 -1.7 79 44 1917 2018 1993 2007 normal 18 57.6 58.3 -0.7 90 33 1917 2018 1993 2007 top-third 1989 24 52.7 53.3 -0.6 98 24 1917 2018 1994 2007 top-third 1986 36 53.0 53.3 -0.3 99 22 1917 2018 1999 2007 top-third 1997 48 53.2 53.2 0.0 103 17 1920 2018 1999 2007 top-third 1997,2014 60 53.1 53.2 -0.1 100 19 1917 2018,2019 1999 2007 top-third 2013