1991-2020 Degrees Fahrenheit 1 45.8 45.1 0.7 69 39 2018 1915 1959 1955 normal 2 31.9 38.2 -6.3 6 102 1965 2012 1951 1959 bottom-tenth 3 27.3 31.7 -4.4 19 89 1965,2014 2012 1956 1959 bottom-third 1913,1982 4 24.7 27.4 -2.7 38 69 1979 2012 1959 1958 normal 5 25.3 26.0 -0.7 60 47 1979 2012 1959 1958 normal 6 24.9 27.2 -2.3 36 71 1979 2012 1959 1958 normal 7 27.6 30.2 -2.6 28 79 1979 2012 1959 1958 bottom-third 8 31.6 34.0 -2.4 29 77 1979 2012 1959 1959 bottom-third 1959 9 36.2 37.8 -1.6 35 70 1979 2012 1959 1958 bottom-third 1916,1963,1966 10 39.6 41.1 -1.5 33 72 1979 2012 1959 1958 bottom-third 1937,1973,1984,2018 11 42.2 43.4 -1.2 35 70 1979 2012 1959 1958 bottom-third 1913,1967,2018 12 43.8 44.6 -0.8 47 58 1979 2012 1959 1958 normal 1950 18 37.0 38.8 -1.8 27 77 1918 2017 1957 1959 bottom-third 1985,1986 24 42.9 44.6 -1.7 18 84 1918 2017 1952 1959 bottom-third 1986 36 43.4 44.6 -1.2 30 69 1918 2017 1953 1959 bottom-third 1966,2015 48 43.7 44.6 -0.9 38 59 1980 1934 1959 1958 normal 1938,1964 60 43.5 44.6 -1.1 30 65 1997 1935 1955 1959 bottom-third 1947,1955,1978,1983