1991-2020 Degrees Fahrenheit 1 59.1 60.4 -1.3 34 45 1964 1997 1950 1947 normal 2019 2 56.0 59.2 -3.2 12 67 1964 1992 1948 1950 bottom-third 1961 3 54.9 58.1 -3.2 15 64 1948 1992 1950 1949 bottom-third 4 53.9 57.1 -3.2 13 65 1948 1992 1950 1951 bottom-third 1965 5 53.0 56.0 -3.0 10 68 1949 1992,2014 1950 1951 bottom-third 1956,1963,1965,1982,1999 6 53.3 55.4 -2.1 28 50 1949 2015 1950 1951 normal 1979 7 54.3 55.6 -1.3 39 39 1949 2015 1950 1951 normal 8 55.2 56.6 -1.4 36 42 1949 2015 1950 1951 normal 9 56.3 57.6 -1.3 34 44 1949 2015 1950 1951 normal 1958 10 57.0 58.4 -1.4 30 48 1949 2015 1950 1951 normal 1983 11 57.5 58.9 -1.4 29 48 1949 2015 1950 1951 normal 12 57.7 59.3 -1.6 27 49 1949 2015 1950 1951 normal 1977 18 55.5 57.9 -2.4 14 61 1950 2015 1950 1951 bottom-third 1962,1975 24 56.8 59.2 -2.4 10 64 1950 2016 1950 1951 bottom-third 1954,1965,1966,1967 36 56.3 59.2 -2.9 2 70 1950 2016 1950 1951 bottom-tenth 1957 48 56.4 59.2 -2.8 2 68 1952 2017,2018 1951 1951 bottom-tenth 1955,1956 60 -99 59.1 -99 -99 -99 1952,1953,1956 2018 normal