1991-2020 Degrees Fahrenheit 1 52.6 51.9 0.7 78 51 1927 1936 1968 1971 normal 2 47.1 47.3 -0.2 55 74 1975 1934 1970 1971 normal 1913,1922,1966,1986,2005 3 43.8 43.0 0.8 87 42 2002 1910 1971 1963 top-third 1895 4 38.3 38.9 -0.6 71 58 1899 1934,1987 1970 1971 normal 1918,1940 5 33.0 36.2 -3.2 37 92 1899 1934 1970 1971 bottom-third 6 30.3 34.5 -4.2 21 107 1969 1992 1969 1971 bottom-third 7 31.1 34.4 -3.3 25 103 1979 1992 1969 1971 bottom-third 1909 8 32.6 35.8 -3.2 22 105 1899 1987 1969 1971 bottom-third 1952,1975 9 35.0 38.2 -3.2 22 105 1899 1934,1987,1992 1969 1971 bottom-third 1975,1985 10 39.0 41.1 -2.1 40 87 1899 1992 1969 1971 bottom-third 11 41.5 43.6 -2.1 36 91 1899 1934,1992 1969 1971 bottom-third 1928,1943,1957 12 43.1 44.9 -1.8 38 89 1899 1934 1969 1971 bottom-third 1928,1955 18 39.6 41.4 -1.8 41 85 1979 1988 1970 1971 bottom-third 1960,1985 24 43.5 44.9 -1.4 41 84 1917,1979 1988,2013 1970 1971 bottom-third 1910,1978,1985,1996 36 43.6 44.9 -1.3 40 83 1952 2000 1971 1968 bottom-third 1903,1924,1937,1958,1984,2011 48 42.8 45.0 -2.2 8 113 1952 1934 1953 1971 bottom-tenth 1909,1912,1917,1930 60 43.4 45.0 -1.6 29 90 1952 2016 1969 1971 bottom-third 1901,1906,1950