1925-2000 Degrees Fahrenheit 1 48.6 49.2 -0.6 30 69 1949 2004 1952 1953 bottom-third 1925 2 44.1 43.5 0.6 53 46 1949 2004 1952 1953 normal 1941,1944,1967 3 36.5 36.8 -0.3 40 59 1949 2016 1952 1953 normal 1944,1947,1973 4 30.7 30.3 0.4 47 52 1972 2019 1952 1953 normal 1934 5 23.3 25.2 -1.9 18 81 1972 2019 1952 1953 bottom-third 6 18.9 21.3 -2.4 13 86 1971 2016 1952 1953 bottom-third 7 17.0 18.8 -1.8 19 79 1971 2016 1952 1953 bottom-third 1927,1964 8 16.3 17.9 -1.6 19 79 1972 2016 1952 1953 bottom-third 9 17.2 18.8 -1.6 18 80 1971 2016 1952 1953 bottom-third 10 19.6 21.0 -1.4 17 81 1971 2019 1952 1953 bottom-third 1943,1955,1959 11 22.3 23.6 -1.3 15 83 1971 2019 1952 1953 bottom-third 1952,1959,1962 12 24.9 26.0 -1.1 18 80 1971 2019 1952 1953 bottom-third 1943,1952,1959 18 23.7 24.4 -0.7 23 75 1972 2016 1952 1953 bottom-third 1960,2009 24 25.9 26.0 -0.1 30 67 1972 2019 1953 1953 bottom-third 1928,1937,1946,1953,1963,1983 36 25.6 26.0 -0.4 29 67 1973 2016 1953 1953 bottom-third 1953 48 25.4 25.9 -0.5 25 70 1974 2019 1952 1953 bottom-third 1955,1964,1969 60 25.6 25.9 -0.3 30 64 1975 2019 1953 1948 bottom-third 1963