1991-2020 Degrees Fahrenheit 1 65.6 63.6 2.0 52 15 1976 1965 1982 1981 top-third 1964 2 70.9 69.2 1.7 57 10 1976 2016 1982 1973 top-third 3 75.3 74.0 1.3 57 10 1976 2021 1982 1977 top-third 4 78.9 77.9 1.0 53 14 1976 2015 1982 1977 top-third 1999 5 81.0 80.3 0.7 53 14 1976 1951 1982 1977 top-third 1956,2005,2020 6 81.7 81.5 0.2 44 23 1976 1951,2011 1982 1982 normal 1982,2017 7 81.6 81.6 0.0 41 26 1976 1998 1982 1980 normal 1964,1999 8 80.4 80.7 -0.3 31 35 1976 2011 1982 1982 normal 1965,1982,2010 9 78.8 79.3 -0.5 27 39 1976 2011 1981 1982 normal 1991,2008 10 76.7 77.4 -0.7 23 42 1976 2011 1982 1982 normal 1982,1988,2003,2014 11 74.7 75.4 -0.7 27 38 1970 2011 1982 1980 normal 1964,1974 12 73.1 73.8 -0.7 27 38 1970,1976 2000,2011 1981 1982 normal 18 75.9 76.3 -0.4 32 33 1976 2012 1982 1981 normal 1964 24 73.1 73.8 -0.7 27 36 1976 2012 1982 1981 normal 2014,2015 36 73.0 73.8 -0.8 24 37 1970 2000 1981 1982 normal 48 73.3 73.7 -0.4 31 28 1970,1971 2001 1982 1956 normal 1994 60 73.0 73.7 -0.7 21 36 1970 1956,2002,2020 1982 1956 normal 1985,1992,1993