1991-2020 Degrees Fahrenheit 1 72.4 71.9 0.5 89 39 1924 2012 1997 1995 top-third 2 69.3 69.7 -0.4 78 50 1929 2012 1997 1995 normal 3 67.3 65.8 1.5 112 15 1917 2012 1997 1991 top-third 1959,2005 4 62.7 61.0 1.7 116 10 1917 1991 1997 1991 top-tenth 5 57.7 56.0 1.7 117 7 1917,1924,1926 2012 1997 1991 top-tenth 1999 6 54.1 51.3 2.8 120 4 1917 2012 1997 1991 top-tenth 7 50.8 47.8 3.0 120 2 1917 2012 1997 1998 top-tenth 8 48.6 45.8 2.8 120 2 1904 2012 1997 1998 top-tenth 9 47.3 45.2 2.1 118 4 1904 2012 1997 1991 top-tenth 2017 10 47.7 45.9 1.8 115 7 1904 2012 1997 1991 top-tenth 11 48.9 47.5 1.4 114 8 1918 2012 1997 1991 top-tenth 1987 12 50.4 49.4 1.0 112 10 1904 2012 1997 1991 top-tenth 1987,2010 18 50.0 50.0 0.0 91 27 1918 2012 1997 1992 top-third 1922 24 48.9 49.4 -0.5 84 32 1918 2017 1997 1992 top-third 2019 36 48.2 49.4 -1.2 63 49 1918 2012 1997 1995 normal 1949,1964,1966 48 48.6 49.4 -0.8 71 37 1918 2013 1997 1994 normal 1922,2016 60 48.3 49.4 -1.1 64 41 1920,1927 2002 1997 1995 normal 1923