1991-2020 Degrees Fahrenheit 1 55.7 53.7 2.0 70 8 1949 2015 1994 1995 top-tenth 2 53.9 52.6 1.3 68 10 1949 2015 1994 1995 top-third 3 54.2 52.2 2.0 76 2 1949 2015 1995 1996 top-tenth 4 55.7 53.3 2.4 76 2 1949 2015 1995 1996 top-tenth 5 57.3 55.2 2.1 76 2 1949 2015 1995 1996 top-tenth 6 58.6 57.0 1.6 73 5 1949 2015 1995 1996 top-tenth 7 59.6 58.1 1.5 73 5 1949 2015 1995 1996 top-tenth 8 60.4 58.9 1.5 73 4 1949 2015 1995 1996 top-tenth 2018 9 60.5 59.3 1.2 70 6 1949 2015 1995 1996 top-tenth 10 60.2 59.4 0.8 70 6 1949 2015 1995 1984 top-tenth 1984,1998 11 59.9 59.2 0.7 68 8 1949 2015 1995 1993 top-tenth 12 59.4 58.9 0.5 66 10 1949 2015 1995 1994 top-third 2017 18 58.1 58.2 -0.1 57 18 1949,1950 2016 1995 1994 top-third 2003,2010,2011,2014 24 58.5 58.8 -0.3 53 21 1950 2016 1992 1995 top-third 1991,1992,1999,2010 36 58.9 58.8 0.1 59 13 1950,1957 2017 1992 1995 top-third 2007 48 59.1 58.8 0.3 65 5 1952,1957 2018 1995 1994 top-tenth 1994,1998,2006 60 58.9 58.7 0.2 61 7 1953,1956,1957 2018 1995 1994 top-tenth 1994,2015