1991-2020 Degrees Fahrenheit 1 32.3 35.7 -3.4 14 46 1965 2012 1978 1979 bottom-third 2 27.4 31.2 -3.8 13 47 1978 2012 1979 1977 bottom-third 3 26.6 29.1 -2.5 17 43 1978 2012 1979 1976 bottom-third 2019 4 28.1 29.4 -1.3 31 29 1978 2012 1979 1976 normal 2019 5 30.6 31.5 -0.9 34 25 2014 2012 1979 1976 normal 6 34.0 34.8 -0.8 30 29 1977 2012 1979 1976 normal 1966,1990 7 38.2 38.9 -0.7 31 28 1977 2012 1979 1976 normal 8 42.0 42.9 -0.9 27 32 1977 2012 1979 1976 normal 9 45.2 46.3 -1.1 25 34 1977 2012 1979 1976 normal 1967,1975 10 47.4 48.5 -1.1 23 36 1978 2012 1979 1976 normal 1973,1997,2009 11 48.3 49.5 -1.2 25 34 1977 2012 1979 1976 normal 12 48.0 49.3 -1.3 21 38 1977 2012 1979 1976 normal 1971,1975,2001 18 42.1 44.5 -2.4 8 50 1979 2017 1979 1977 bottom-third 24 47.2 49.3 -2.1 7 51 1994 2013 1979 1977 bottom-third 1982 36 47.1 49.3 -2.2 3 54 1979 2013 1979 1978 bottom-tenth 48 46.9 49.3 -2.4 1 55 1980 2013 1980 1979 lowest 60 47.4 49.2 -1.8 5 50 1981 2020 1979 1979 bottom-tenth 1969,1979