1991-2020 Degrees Fahrenheit 1 75.1 72.6 2.5 73 3 1979 2010 2007 1994 top-tenth 2 67.6 68.1 -0.5 41 35 1967 2010 2006 2007 normal 1976,2006 3 63.3 63.4 -0.1 51 25 1950 2010 2007 2006 top-third 1960,1976 4 58.6 58.4 0.2 52 22 1950 2010 2007 2006 top-third 1994 5 54.3 53.8 0.5 54 20 1978 2012 2007 2006 top-third 2021 6 51.2 50.4 0.8 61 13 1978 2012 2007 2006 top-third 2021,2022 7 49.2 48.7 0.5 56 17 1978 2012 2007 2006 top-third 1983,2021 8 48.7 48.4 0.3 50 22 1978 2012 2005 2007 top-third 9 50.4 49.4 1.0 63 9 1978 2012 2007 2006 top-third 2006,2021 10 52.4 51.4 1.0 63 9 1978 2012 2007 2006 top-third 1998 11 54.6 53.6 1.0 63 9 1978 2012,2017 2007 2006 top-third 12 56.4 55.6 0.8 61 11 1963 2012 2007 2006 top-third 2000 18 54.2 53.8 0.4 57 13 1979 2012,2017 2006 2007 top-third 1954,2006,2011 24 56.1 55.5 0.6 58 10 1978 2017 2006 2007 top-third 36 56.3 55.5 0.8 58 6 1979 2018,2022 2007 2000 top-tenth 2000,2012,2017 48 55.8 55.4 0.4 52 8 1980 2019,2020,2022 2007 2002 top-third 2002 60 55.7 55.3 0.4 49 8 1967,1970 2020 2007 2002 top-third