1925-2000 Degrees Fahrenheit 1 48.9 49.5 -0.6 32 67 1969 2004 1932 1931 bottom-third 1929 2 50.3 51.2 -0.9 20 79 1969 2004 1932 1931 bottom-third 1935 3 48.9 50.5 -1.6 7 92 1949,1955,1965 2004 1932 1931 bottom-tenth 1970 4 46.0 47.3 -1.3 9 90 1965 2004 1932 1931 bottom-tenth 1966,1973 5 41.8 42.5 -0.7 27 72 1949 2004 1932 1930 bottom-third 1928,1939 6 36.3 37.2 -0.9 25 74 1971 2019 1931 1932 bottom-third 1931,1963 7 31.4 32.6 -1.2 22 77 1971,1972 2019 1932 1931 bottom-third 1959 8 26.4 28.8 -2.4 8 91 1971 2016 1932 1932 bottom-tenth 1932 9 24.0 26.0 -2.0 12 86 1971 2016 1932 1931 bottom-third 1934,1976 10 22.1 24.6 -2.5 7 91 1971 2016 1933 1932 bottom-tenth 1947 11 22.6 24.7 -2.1 9 89 1971 2016 1933 1932 bottom-tenth 12 23.9 26.0 -2.1 8 90 1971 2019 1933 1932 bottom-tenth 18 28.3 29.7 -1.4 14 84 1972 2016 1928 1932 bottom-third 1928 24 24.3 26.0 -1.7 10 87 1972 2019 1933 1932 bottom-tenth 36 25.1 26.0 -0.9 17 79 1973 2016 1933 1932 bottom-third 48 25.3 25.9 -0.6 23 72 1974 2019 1933 1932 bottom-third 1954,1955,1962 60 25.7 25.9 -0.2 32 62 1975 2019 1933 1932 normal 1947