1991-2020 Degrees Fahrenheit 1 34.8 35.4 -0.6 32 29 1965 2012 1980 1979 normal 2 32.3 30.9 1.4 44 17 1978 2012 1980 1976 top-third 1992,2009 3 28.3 28.7 -0.4 35 26 2014 2012 1980 1976 normal 2001 4 27.4 29.1 -1.7 24 37 2014 2012 1979 1980 normal 1985 5 29.4 31.2 -1.8 21 39 2014 2012 1979 1980 normal 6 32.0 34.5 -2.5 12 48 1977 2012 1979 1980 bottom-third 7 36.4 38.6 -2.2 12 48 1977 2012 1979 1980 bottom-third 1971 8 40.8 42.6 -1.8 15 45 1977 2012 1979 1980 bottom-third 1986,2001 9 44.3 45.9 -1.6 16 44 1977 2012 1979 1980 bottom-third 1969,1971 10 46.3 48.2 -1.9 12 48 1977 2012 1979 1980 bottom-third 1968,2001 11 47.5 49.1 -1.6 15 45 1977 2012 1979 1980 bottom-third 1986 12 47.4 49.0 -1.6 15 45 1977 2012 1979 1980 bottom-third 18 42.9 44.1 -1.2 18 41 1979 2017 1980 1976 bottom-third 24 47.6 49.0 -1.4 13 46 1994 2013,2017 1980 1977 bottom-third 1967,1977 36 47.3 48.9 -1.6 5 53 1979 2013 1980 1978 bottom-tenth 1969,1982,1995 48 47.3 48.9 -1.6 7 50 1980 2013 1980 1978 bottom-third 1968 60 47.0 48.9 -1.9 1 55 1981 2020 1981 1980 lowest