1991-2020 Degrees Fahrenheit 1 57.4 57.3 0.1 53 32 1976 1965 1959 1946 normal 1967 2 63.1 62.7 0.4 64 21 1976 2016 1959 1960 top-third 1989,1999,2010 3 68.0 68.1 -0.1 58 27 1976 2016 1959 1954 top-third 1984 4 71.6 72.3 -0.7 45 40 1976 2016 1959 1956 normal 1969,2012 5 73.9 74.7 -0.8 45 40 1976 2011,2016 1959 1956 normal 1994,2001 6 75.0 75.9 -0.9 42 42 1976 2011 1959 1956 normal 1948 7 74.5 75.7 -1.2 32 52 1976 1998 1959 1956 normal 1942,1971,1986 8 73.6 74.6 -1.0 38 46 1976 2011 1959 1956 normal 9 70.9 72.9 -2.0 15 69 1976 2011 1959 1956 bottom-third 10 68.2 70.9 -2.7 6 78 1940 2011,2016 1958 1959 bottom-tenth 1958 11 66.2 68.9 -2.7 7 77 1940 2016 1958 1959 bottom-tenth 12 64.9 67.3 -2.4 7 77 1940 2016 1959 1958 bottom-tenth 1976,1978,1983 18 67.7 70.2 -2.5 2 81 1968 2016 1960 1959 bottom-tenth 1977 24 64.8 67.3 -2.5 4 79 1979 2017 1959 1959 bottom-tenth 1941,1959 36 64.9 67.3 -2.4 2 80 1961 2017,2018 1960 1959 bottom-tenth 48 65.2 67.2 -2.0 5 76 1961 2018 1943 1959 bottom-tenth 1943,1981 60 65.6 67.2 -1.6 15 65 1962 2019,2020 1944 1959 bottom-third 1964,1968,1969,1976,1985