1991-2020 Degrees Fahrenheit 1 49.7 50.2 -0.5 45 40 1983 2021 1941 1940 normal 2 51.1 53.7 -2.6 16 69 2000 2021 1941 1940 bottom-third 3 58.3 58.5 -0.2 55 30 1976 2021 1940 1941 normal 1949,2010 4 63.6 63.7 -0.1 60 25 1976 2015 1940 1941 top-third 1990 5 67.9 67.8 0.1 64 21 1976 2015 1940 1941 top-third 1970,2006 6 70.6 70.6 0.0 61 24 1976 2015 1940 1939 top-third 2003 7 71.9 72.2 -0.3 58 26 1976 2015 1940 1941 top-third 1964,1978,1994,2003,2013 8 72.2 72.5 -0.3 61 23 1976 2015 1940 1941 top-third 1978,1990,1999,2017,2020 9 71.6 71.9 -0.3 54 30 1976 2015 1940 1941 normal 10 69.6 70.7 -1.1 38 46 1976 2011,2016 1940 1941 normal 1970,1988,2008 11 67.5 69.0 -1.5 26 58 1983 2016 1940 1941 bottom-third 1945,1967,2014 12 65.9 67.3 -1.4 29 55 1940 2016 1940 1941 normal 1943,1944,1948,1951,1952,1967,1969 18 66.7 68.4 -1.7 17 67 1968 2016 1940 1941 bottom-third 1945,1978,1982,1989 24 64.7 67.3 -2.6 3 80 1979 2017 1941 1941 bottom-tenth 1959 36 -99 67.3 -99 -99 -99 1960 2017 normal 48 -99 67.3 -99 -99 -99 1961 2018 normal 60 -99 67.2 -99 -99 -99 1961,1962 2019 normal