1991-2020 Degrees Fahrenheit 1 64.7 63.5 1.2 65 10 1950 2007 2018 2013 top-third 2 65.2 64.5 0.7 64 11 1950 2011 2017 2018 top-third 2000,2012 3 63.4 63.3 0.1 57 18 1950 2011 2009 2018 top-third 4 59.6 60.5 -0.9 44 31 1950 2012 2004 2018 normal 1952,1988,1989 5 56.6 57.0 -0.4 53 22 1975 2012 2009 2018 top-third 1954,1969,1989 6 53.3 53.3 0.0 57 18 1950,1975 2012 2013 2018 top-third 1989 7 48.7 49.2 -0.5 51 24 1979 2020 2013 2018 top-third 1989,1999 8 43.8 45.2 -1.4 39 36 1984 2018 2013 2018 normal 1998 9 41.2 42.2 -1.0 35 38 1979 2018 2013 2018 normal 10 40.0 41.0 -1.0 35 38 1973 2018 2013 2018 normal 1951 11 40.4 41.3 -0.9 40 33 1973,1992 2018 2013 2018 normal 1959,1990 12 41.9 42.5 -0.6 47 26 1973,1992 2018 2013 2018 normal 1954 18 46.2 46.1 0.1 56 17 1984 2018 2013 2018 top-third 2004,2009 24 43.8 42.5 1.3 66 5 1993 2018 2013 2018 top-tenth 2006 36 44.1 42.4 1.7 67 2 1975 2018 2013 2018 top-tenth 48 44.0 42.3 1.7 66 1 1976 2019,2020 2013 2019 highest 2020 60 -99 42.2 -99 -99 -99 1977 2020 normal