1991-2020 Degrees Fahrenheit 1 51.3 50.2 1.1 61 24 1983 2021 2005 2001 top-third 2 54.5 53.7 0.8 60 25 2000 2021 2004 2005 top-third 1988 3 58.7 58.5 0.2 60 25 1976 2021 2002 2005 top-third 1975,1985 4 63.3 63.7 -0.4 56 29 1976 2015 2002 2005 normal 1946,1947,1962,1964,1978,1999 5 67.9 67.8 0.1 64 21 1976 2015 2002 2005 top-third 1941,1970 6 70.8 70.6 0.2 67 18 1976 2015 2003 2005 top-third 1971,1980,2012 7 72.2 72.2 0.0 66 18 1976 2015 2004 2005 top-third 2017 8 72.6 72.5 0.1 67 17 1976 2015 2004 2005 top-third 9 72.4 71.9 0.5 74 10 1976 2015 2005 1998 top-third 2018,2019 10 71.3 70.7 0.6 74 10 1976 2011,2016 2005 1998 top-third 2007 11 69.2 69.0 0.2 70 14 1983 2016 2004 2005 top-third 1990,2010,2019 12 68.0 67.3 0.7 76 8 1940 2016 2005 2005 top-tenth 1999,2005 18 69.3 68.4 0.9 77 7 1968 2016 2005 1999 top-tenth 24 68.0 67.3 0.7 75 8 1979 2017 2005 1999 top-tenth 36 67.8 67.3 0.5 73 9 1960 2017 2005 2000 top-third 2022 48 67.5 67.3 0.2 68 13 1961 2018 2005 2001 top-third 2000,2008,2015 60 67.3 67.2 0.1 65 15 1961,1962 2019 2005 2002 top-third 2001,2009,2011