1925-2000 Degrees Fahrenheit 1 49.1 49.5 -0.4 39 60 1969 2004 1933 1931 normal 1975 2 49.8 51.2 -1.4 10 89 1969 2004 1932 1933 bottom-tenth 1961,1981,2008 3 49.3 50.5 -1.2 12 87 1949,1955,1965 2004 1933 1931 bottom-third 1961 4 46.1 47.3 -1.2 12 87 1965 2004 1933 1931 bottom-third 1935,1939,1971 5 42.1 42.5 -0.4 35 64 1949 2004 1933 1926 normal 1954,2000,2008 6 37.1 37.2 -0.1 36 63 1971 2019 1933 1932 normal 1932,1944,1962,1974 7 33.7 32.6 1.1 60 39 1971,1972 2019 1933 1926 normal 8 28.0 28.8 -0.8 32 67 1971 2016 1933 1931 bottom-third 9 24.0 26.0 -2.0 12 86 1971 2016 1933 1933 bottom-third 1933,1976 10 22.8 24.6 -1.8 15 83 1971 2016 1933 1932 bottom-third 11 22.7 24.7 -2.0 10 88 1971 2016 1933 1932 bottom-tenth 1965 12 24.0 26.0 -2.0 9 89 1971 2019 1933 1932 bottom-tenth 18 28.1 29.7 -1.6 8 90 1972 2016 1934 1933 bottom-tenth 1946,1973 24 24.0 26.0 -2.0 4 93 1972 2019 1934 1933 bottom-tenth 1966,1973,1975 36 24.2 26.0 -1.8 7 89 1973 2016 1934 1933 bottom-tenth 48 24.8 25.9 -1.1 10 85 1974 2019 1934 1933 bottom-third 1956 60 25.1 25.9 -0.8 17 77 1975 2019 1934 1933 bottom-third 1936,1958