1991-2020 Degrees Fahrenheit 1 73.8 74.8 -1.0 21 46 1976 1979 2001 2004 bottom-third 2 81.0 79.2 1.8 57 10 1976 2015 2004 1979 top-third 3 83.0 82.7 0.3 46 21 1976 2015 2004 2000 top-third 1985,2016 4 85.0 84.4 0.6 49 18 1976 1951 2004 2000 top-third 1953,2022 5 85.5 85.1 0.4 46 21 1976 1951 2004 2001 top-third 1996 6 84.5 84.6 -0.1 40 27 1976 1998 2004 2002 normal 2002 7 82.9 83.2 -0.3 37 29 1976 2011 2004 2002 normal 1978,1982,1984 8 80.8 81.3 -0.5 29 37 1976 2011 2004 2002 normal 2013 9 78.3 79.0 -0.7 27 38 1987 2011 2004 2002 normal 1972,1974,2021 10 76.4 76.6 -0.2 41 24 1970 2000 2004 2002 normal 1989,1991,1995,2001,2002 11 74.4 74.7 -0.3 36 29 1968,1970,1987 2000 2004 2002 normal 2015 12 73.4 73.8 -0.4 31 34 1970 2000 2004 2002 normal 18 76.7 77.4 -0.7 29 36 1977 2000 2004 2002 normal 1983,2014 24 73.3 73.8 -0.5 34 29 1976 2000 2004 2003 normal 1981,2003 36 73.1 73.8 -0.7 25 36 1970 2000 2003 2004 normal 1993,2003 48 73.3 73.8 -0.5 31 28 1971 1956,2001 2004 2003 normal 1994 60 73.2 73.7 -0.5 27 30 1970,1977,1979 1956,2002 1994 2004 normal 1986,2007