1991-2020 Degrees Fahrenheit 1 56.2 57.4 -1.2 44 63 1945 1934 2019 2018 normal 2 49.5 51.2 -1.7 27 80 1983 1977 2019 2017 bottom-third 1940,1975 3 44.9 44.6 0.3 71 36 1950 2012 2019 2017 normal 1959,1973 4 37.9 38.1 -0.2 71 36 1917 2012 2019 2017 normal 1935 5 34.1 33.4 0.7 76 30 1979 2012 2019 2017 top-third 1941,1944,1973 6 32.0 31.2 0.8 84 22 1979 2012 2019 2017 top-third 1944,1990 7 31.5 31.5 0.0 74 32 1979 2012 2019 2017 top-third 1946 8 33.0 33.6 -0.6 62 44 1979 2012 2019 2017 normal 1935 9 36.6 36.6 0.0 74 31 1979 2012 2019 2017 top-third 1949,1955 10 39.6 39.8 -0.2 68 36 1979 2012 2019 2017 normal 1958,1992 11 42.6 42.6 0.0 69 35 1979 2012 2019 2017 normal 12 44.6 44.6 0.0 67 37 1979 2012 2019 2017 normal 1911,1944 18 39.3 40.1 -0.8 50 53 1979 2017 2019 2018 normal 1920,1989,2010 24 43.8 44.6 -0.8 46 55 1979 2017 2019 2018 normal 1916,1982 36 43.9 44.6 -0.7 46 52 1918 2018 2015 2019 normal 1954,1957,1977 48 44.8 44.6 0.2 77 19 1996,1997 1934 2016 2019 top-third 1941,2003,2015 60 45.4 44.6 0.8 89 5 1997 1935 2019 2016 top-tenth 2008,2016