1991-2020 Degrees Fahrenheit 1 51.7 55.3 -3.6 11 65 1950 1958 2011 2018 bottom-third 2 49.2 50.5 -1.3 33 43 1975 1980 2011 2018 normal 3 42.5 46.3 -3.8 12 64 2002 2012 2002 2018 bottom-third 1995 4 34.0 42.1 -8.1 1 75 2019 2016 2019 2018 lowest 5 33.0 39.0 -6.0 6 70 1979 1992 1982 2018 bottom-tenth 1951 6 32.6 37.1 -4.5 10 65 1979 1992 1982 2018 bottom-third 7 33.1 36.9 -3.8 12 63 1979 1992 2011 2018 bottom-third 1962,1982 8 34.7 38.3 -3.6 12 63 1979 2016 1997 2018 bottom-third 1975 9 37.3 40.9 -3.6 15 60 1979 2016 1997 2018 bottom-third 1971 10 40.5 43.9 -3.4 11 64 1979 2016 1997 2018 bottom-third 1997 11 43.4 46.6 -3.2 14 61 1979 2016 1997 2018 bottom-third 1997 12 45.2 48.1 -2.9 14 61 1979 2016 1979 2018 bottom-third 18 41.4 44.4 -3.0 12 62 1979 2016 1997 2018 bottom-third 1997 24 46.1 48.1 -2.0 22 52 1979 2016 1997 2018 bottom-third 36 47.0 48.1 -1.1 35 38 1952 2017 2011 2018 normal 1961,1964,1985 48 48.1 48.1 0.0 54 18 1952 2016 2012 2018 top-third 1990,2003,2004 60 48.4 48.2 0.2 60 11 1953 2016 2014 2018 top-third 1992,2002