1991-2020 Degrees Fahrenheit 1 71.7 72.3 -0.6 32 44 1972 1952 1993 1994 normal 2 66.9 68.5 -1.6 21 55 1961 2018 1992 1994 bottom-third 3 63.1 64.7 -1.6 21 55 1961 1991 1992 1994 bottom-third 1966 4 59.1 60.0 -0.9 26 50 1960 1991 1993 1994 normal 1963,1966,1988,2006 5 54.1 55.6 -1.5 21 55 1958 1991 1993 1994 bottom-third 1969,1984,2013 6 50.9 52.2 -1.3 26 50 1978 2012 1988 1994 normal 1985 7 49.6 50.3 -0.7 40 36 1978 2012 1994 1992 normal 2004,2005 8 49.7 49.8 -0.1 51 24 1977 2012 1994 1991 top-third 1973,2005,2006,2008 9 50.3 50.6 -0.3 45 30 1977 1991,2012 1994 1992 normal 2021 10 51.8 52.4 -0.6 41 33 1977 2017 1994 1992 normal 1990,2004,2009,2010 11 53.7 54.4 -0.7 34 40 1977 2017 1994 1994 normal 1989,1990,1994,2009,2013 12 55.6 56.2 -0.6 39 35 1977 2017 1993 1994 normal 1973,1988,1990 18 54.2 54.9 -0.7 39 35 1977,1978,1979 2017 1993 1994 normal 2009 24 55.7 56.1 -0.4 42 31 1978 2017 1994 1993 normal 1989,1990,2005,2011 36 55.6 56.1 -0.5 30 42 1979 2018 1985 1994 normal 1973,2005,2011,2016 48 55.8 56.1 -0.3 34 37 1980 2019 1986 1994 normal 2001,2005 60 56.3 56.1 0.2 63 7 1981 2020 1994 1992 top-tenth 1954,1991,1992,2008,2009,2013,2016,2017