1991-2020 Degrees Fahrenheit 1 56.7 56.5 0.2 66 20 1949 2003 1995 1993 top-third 2 57.3 56.0 1.3 76 10 1949 2018 1995 1986 top-third 3 60.7 58.9 1.8 80 5 1949 2018 1995 1996 top-tenth 4 64.8 63.4 1.4 77 7 1949 2018 1995 1996 top-tenth 5 69.8 68.5 1.3 79 5 1973 2018 1995 1996 top-tenth 2015 6 74.1 72.7 1.4 80 4 1973 2018 1995 1996 top-tenth 7 77.1 75.9 1.2 81 3 1942 2021 1995 1996 top-tenth 8 78.4 77.8 0.6 74 10 1942 2018 1995 1996 top-third 2008,2014 9 78.2 78.2 0.0 64 19 1942 2021 1995 1996 top-third 1998,2009,2012 10 77.3 77.7 -0.4 57 25 1942 2021 1995 1990 top-third 2011 11 76.2 76.6 -0.4 57 25 1942 2018 1995 1990 top-third 2001 12 75.2 75.2 0.0 63 19 1942 2018 1995 1990 top-third 2000 18 73.9 74.4 -0.5 55 25 1945 2018 1995 1990 top-third 2002 24 74.7 75.2 -0.5 51 27 1943 2018 1995 1991 normal 2012 36 74.4 75.2 -0.8 45 31 1944,1945 2019 1995 1992 normal 48 74.4 75.2 -0.8 43 31 1945 2018 1995 1993 normal 1993 60 74.3 75.1 -0.8 41 31 1966,1976 2018,2019,2021,2022 1995 1994 normal 1990,1994