1991-2020 Degrees Fahrenheit 1 73.6 67.2 6.4 84 1 1976 2004 2003 2004 highest 2 75.7 72.6 3.1 83 2 1976 2016 2003 2004 top-tenth 2015 3 77.0 76.3 0.7 66 19 1976 2011 2003 2000 top-third 4 78.2 78.1 0.1 62 23 1976 2011 2003 2000 top-third 5 78.3 78.6 -0.3 56 28 1976 2011 2003 2002 top-third 1969,2002,2020 6 77.7 77.8 -0.1 60 24 1976 1998,2011 2003 2000 top-third 1953 7 75.9 76.1 -0.2 61 23 1976 2011 2003 2002 top-third 1947,2017 8 74.2 73.9 0.3 66 18 1976 2011 2003 2000 top-third 2005 9 71.2 71.4 -0.2 62 22 1940,1968 2011 2003 2000 top-third 1953,2013 10 69.0 69.1 -0.1 63 21 1940 2012 2003 2000 top-third 2013 11 67.1 67.3 -0.2 64 20 1940 2016,2022 2003 2000 top-third 12 66.6 66.4 0.2 69 15 1940 2016 2003 2000 top-third 2013 18 70.1 70.2 -0.1 65 18 1968 2016 2003 2000 top-third 2015 24 65.7 66.3 -0.6 60 23 1961 2017 2003 2001 top-third 1986,2001 36 65.9 66.3 -0.4 60 22 1961 2018 2003 2002 top-third 1956,2002,2015 48 65.4 66.3 -0.9 52 29 1961 2018,2019 1997 2003 normal 1953 60 65.8 66.2 -0.4 57 23 1962 2020 1998 2003 top-third 2005