1925-2000 Degrees Fahrenheit 1 27.7 25.5 2.2 64 35 1996 2013 1931 1926 normal 1942,1964 2 33.1 33.0 0.1 42 57 1992 2018 1931 1929 normal 1935,1945,2012 3 37.8 38.5 -0.7 25 74 1996 2018 1928 1931 bottom-third 1966 4 41.2 42.1 -0.9 23 76 1970 2019 1931 1931 bottom-third 1931,1988 5 42.4 43.5 -1.1 16 83 1970 2019 1928 1931 bottom-third 1947,1975,1982 6 41.4 42.6 -1.2 15 84 1965,1970 2019 1928 1931 bottom-third 1928,1952 7 39.1 39.8 -0.7 29 70 1985 2016,2019 1931 1930 bottom-third 1947,1984,2000 8 36.1 36.2 -0.1 40 59 1971 2019 1931 1926 normal 1962,1974 9 31.5 32.7 -1.2 17 82 1971 2019 1930 1931 bottom-third 1965 10 27.7 29.6 -1.9 7 92 1971 2016 1932 1931 bottom-tenth 1964 11 25.6 27.3 -1.7 11 87 1971 2016 1927 1931 bottom-third 1927 12 24.8 26.0 -1.2 17 81 1956 2016 1932 1931 bottom-third 18 30.4 31.5 -1.1 15 83 1956,1971 2016,2019 1932 1931 bottom-third 1955 24 25.7 25.9 -0.2 27 70 1972 2019 1928 1931 bottom-third 1961,1983,2013 36 25.7 25.9 -0.2 30 66 1973 2016 1932 1931 bottom-third 48 26.2 25.9 0.3 42 53 1974 2019 1930 1931 normal 1939,1986 60 26.0 25.9 0.1 37 57 1975 2019 1932 1931 normal 1961,1986