1991-2020 Degrees Fahrenheit 1 72.5 71.9 0.6 94 34 1924 2012 2015 2012 top-third 2 70.1 69.7 0.4 100 28 1929 2012 2015 2012 top-third 1943,1954,1959,1964,1966,2007 3 66.1 65.8 0.3 95 32 1917 2012 2015 2013 top-third 1941,1962 4 61.1 61.0 0.1 94 32 1917 1991 2015 2012 top-third 2018 5 56.9 56.0 0.9 109 15 1917,1924,1926 2012 2015 2012 top-third 2022 6 52.5 51.3 1.2 114 10 1917 2012 2015 2012 top-tenth 7 48.9 47.8 1.1 110 12 1917 2012 2015 2012 top-tenth 8 47.8 45.8 2.0 116 6 1904 2012 2015 2012 top-tenth 9 47.6 45.2 2.4 119 3 1904 2012 2015 2012 top-tenth 10 48.0 45.9 2.1 118 4 1904 2012 2015 2012 top-tenth 1991 11 49.8 47.5 2.3 119 3 1918 2012 2015 2012 top-tenth 2017 12 51.5 49.4 2.1 119 3 1904 2012 2015 2012 top-tenth 18 50.5 50.0 0.5 102 16 1918 2012 2015 2013 top-third 24 49.4 49.4 0.0 93 23 1918 2017 2015 2013 top-third 36 48.4 49.4 -1.0 71 41 1918 2012 2015 2014 normal 1977 48 48.6 49.4 -0.8 71 37 1918 2013 1998 2015 normal 1922,1998 60 49.5 49.4 0.1 88 17 1920,1927 2002 2015 2014 top-third 2004