1991-2020 Degrees Fahrenheit 1 66.7 63.5 3.2 59 8 1976 1965 2015 2016 top-third 2 69.6 69.1 0.5 46 21 1976 2016 2014 2016 top-third 2011 3 74.5 73.9 0.6 47 20 1976 2021 2014 2016 top-third 4 78.2 77.9 0.3 48 19 1976 2015 2014 2016 top-third 1998,2020 5 80.7 80.2 0.5 49 18 1976 2015 2014 2016 top-third 6 81.7 81.5 0.2 44 23 1976 2011 2014 2016 normal 7 81.4 81.5 -0.1 41 26 1976 1998 2014 2016 normal 2010 8 80.6 80.7 -0.1 41 25 1976 2011 2014 2016 normal 1955,2019 9 79.6 79.3 0.3 50 16 1976 2011 2015 2016 top-third 1954 10 78.2 77.4 0.8 57 8 1976 2011 2015 2016 top-third 2018,2022 11 76.4 75.4 1.0 58 7 1970 2011 2016 2012 top-third 12 74.8 73.8 1.0 59 6 1970,1976,1987 2011 2016 2012 top-tenth 2009,2012 18 77.5 76.3 1.2 61 4 1976 2012,2022 2016 2012 top-tenth 2000,2006 24 74.8 73.7 1.1 60 3 1976 2012 2016 2012 top-tenth 36 74.4 73.7 0.7 56 5 1970 2000 2016 2013 top-tenth 2022 48 73.9 73.7 0.2 46 13 1971 2001 2016 2014 top-third 1955,2003,2021 60 73.8 73.6 0.2 43 14 1970 2002 2016 2016 top-third 1999,2009,2016