1925-2000 Degrees Fahrenheit 1 5.8 4.8 1.0 45 55 1990 2016 1952 1947 normal 1973 2 0.4 3.5 -3.1 24 76 1925 2016 1952 1949 bottom-third 3 2.2 3.6 -1.4 30 69 1965 2001 1952 1948 bottom-third 1930 4 7.0 5.6 1.4 54 45 1956 2003 1952 1948 normal 5 11.5 9.6 1.9 62 37 1956 2003 1952 1948 normal 2007 6 16.0 14.8 1.2 53 46 1956 2003 1952 1948 normal 7 20.7 19.7 1.0 53 46 1956 2003 1952 1948 normal 1948 8 24.6 23.9 0.7 53 46 1956 2003 1952 1948 normal 1930 9 27.2 26.7 0.5 51 48 1956 2003 1952 1948 normal 1968,2022 10 27.7 27.8 -0.1 36 63 1956 2003 1951 1952 normal 1928,2013 11 27.0 27.4 -0.4 32 67 1956 2016 1951 1952 bottom-third 1955 12 25.5 26.0 -0.5 28 71 1956 2016 1952 1952 bottom-third 1952,1983,1990 18 21.8 22.2 -0.4 24 74 1972 2016 1952 1951 bottom-third 1932,1935,2000,2013 24 25.5 26.0 -0.5 21 77 1957 2016,2017 1950 1952 bottom-third 1955,1968 36 25.6 25.9 -0.3 30 67 1973,1974 2017,2018 1952 1946 bottom-third 1932 48 25.5 25.9 -0.4 24 72 1974 2019 1952 1948 bottom-third 1954,1955 60 25.0 25.9 -0.9 16 79 1976 2019,2020 1951 1952 bottom-third 1958,1965