1991-2020 Degrees Fahrenheit 1 83.8 81.4 2.4 73 3 1967 2011 1998 1999 top-tenth 2 82.2 81.5 0.7 66 10 1967 2011 1997 1998 top-third 3 81.0 80.8 0.2 58 18 1961 2011 1997 1998 top-third 4 79.0 79.1 -0.1 57 19 1961 2022 1997 1998 top-third 5 77.2 76.6 0.6 66 10 1961 2011 1997 1998 top-third 1954,2000,2018 6 74.0 73.9 0.1 58 18 1983 2011 1998 1998 top-third 1998,2004,2007 7 71.5 71.1 0.4 63 13 1958 2012 1998 1999 top-third 8 69.4 68.6 0.8 65 11 1958,1978 2012 1998 1999 top-third 9 68.0 66.8 1.2 68 7 1978 2012 1998 1999 top-tenth 10 67.4 66.0 1.4 70 5 1969 2017 1998 1999 top-tenth 11 67.7 66.2 1.5 70 5 1977 2017 1998 1999 top-tenth 12 68.6 67.1 1.5 72 3 1977 2017 1998 1999 top-tenth 2012,2020,2022 18 70.4 69.4 1.0 69 6 1977 2017 1998 1999 top-tenth 24 67.5 67.1 0.4 62 12 1978 2017 1998 1999 top-third 36 67.1 67.1 0.0 58 15 1970,1979 2018 1998 1999 top-third 2009,2011 48 66.6 67.0 -0.4 44 28 1961,1970,1971,1980 2019 1998 1957 normal 60 66.7 67.0 -0.3 47 24 1970 2020 1998 1955 normal 1955,2004,2005