1991-2020 Degrees Fahrenheit 1 72.2 68.1 4.1 81 4 1976 2004 2020 2016 top-tenth 2 75.5 73.5 2.0 77 8 1976 2016 2020 2019 top-tenth 1963,2013 3 78.6 77.2 1.4 72 13 1976 2011 2020 2019 top-third 1947,2000 4 79.8 79.1 0.7 69 16 1976 2011 2020 2019 top-third 5 80.2 79.6 0.6 70 14 1976 2011 2020 2019 top-third 1941,2000 6 79.0 78.8 0.2 68 16 1976 1998 2020 2019 top-third 1956,2007,2012 7 77.0 77.1 -0.1 64 20 1976 2011 2020 2019 top-third 2013 8 75.0 74.9 0.1 65 19 1976 2011 2020 2019 top-third 2005 9 71.6 72.4 -0.8 48 36 1940 2011 2014 2020 normal 1948 10 69.4 70.0 -0.6 56 28 1940 2012 2014 2020 top-third 1980 11 67.6 68.2 -0.6 55 29 1940 2016 2014 2020 normal 1980,1991,2008 12 67.1 67.3 -0.2 61 23 1940 2016 2014 2020 top-third 18 70.6 71.1 -0.5 57 26 1977 2012,2016 2014 2020 top-third 24 67.2 67.3 -0.1 66 17 1961,1979 2017 2015 2020 top-third 36 67.2 67.3 -0.1 65 17 1961 2018 2015 2020 top-third 1955,2005 48 67.5 67.2 0.3 69 12 1961 2018,2019 2016 2020 top-third 2001,2016 60 67.9 67.2 0.7 76 4 1962 2019,2020 2017 2020 top-tenth 2017