1991-2020 Degrees Fahrenheit 1 57.9 57.0 0.9 47 31 1976 1963 1948 1947 normal 2 60.3 63.0 -2.7 11 67 2009 1963 1949 1948 bottom-third 1987 3 65.3 68.0 -2.7 12 66 1967 1947 1949 1948 bottom-third 1985,1987,1989 4 68.6 70.9 -2.3 16 61 1967 1954 1949 1948 bottom-third 1968 5 69.9 71.8 -1.9 25 52 1967 1954 1949 1948 bottom-third 6 69.4 70.8 -1.4 32 45 1967 2018 1948 1947 normal 7 66.9 68.6 -1.7 23 54 1961 2012 1949 1948 bottom-third 1995 8 63.6 65.7 -2.1 20 57 1951 2012 1949 1948 bottom-third 1979 9 59.8 62.2 -2.4 15 62 1960 2012 1949 1948 bottom-third 1975 10 56.1 59.0 -2.9 10 67 1979 2012 1949 1948 bottom-third 11 54.0 56.7 -2.7 13 64 1979 2012 1949 1948 bottom-third 1959,1967 12 53.1 55.7 -2.6 13 64 1979 2012 1948 1947 bottom-third 1958 18 58.4 60.7 -2.3 14 62 1951,1979 2012 1949 1948 bottom-third 1996 24 53.0 55.6 -2.6 9 67 1979 2017 1949 1948 bottom-third 1952 36 53.5 55.6 -2.1 13 62 1979 2018 1949 1949 bottom-third 1967,1968,1978 48 -99 55.6 -99 -99 -99 1951,1962 2018 normal 60 -99 55.6 -99 -99 -99 1962 2016 normal