1991-2020 Degrees Fahrenheit 1 62.1 65.5 -3.4 17 67 1967 1991 1954 1959 bottom-third 2 60.5 60.8 -0.3 54 30 1940 2019 1958 1959 normal 3 51.6 55.6 -4.0 4 80 1940 2012 1950 1959 bottom-tenth 4 47.9 51.2 -3.3 9 75 1978 2012 1958 1959 bottom-third 5 45.6 48.0 -2.4 24 60 1940 2012 1958 1959 bottom-third 6 44.6 46.6 -2.0 30 54 1940 2012 1958 1959 normal 7 44.7 46.8 -2.1 27 56 1940 2012 1958 1959 bottom-third 1944 8 46.7 48.3 -1.6 31 52 1940 2012 1958 1959 normal 1962,1989 9 49.4 50.7 -1.3 35 48 1940 2012 1959 1957 normal 1973,1980 10 52.3 53.4 -1.1 45 38 1940 2012 1959 1957 normal 1962,1971 11 54.6 55.7 -1.1 43 40 1963 2012 1959 1957 normal 1962,1971 12 56.3 57.3 -1.0 45 37 1963 2012 1959 1957 normal 1986,1989,2005 18 52.5 53.7 -1.2 42 40 1941 2017 1959 1958 normal 1958,1975,1987,1989 24 55.8 57.2 -1.4 27 53 1978 2012 1959 1958 normal 36 55.6 57.2 -1.6 19 59 1979 2013 1943 1959 bottom-third 1962 48 55.9 57.2 -1.3 25 51 1966 2022 1959 1957 bottom-third 1946,1977 60 55.8 57.1 -1.3 23 51 1967 2020,2021 1959 1958 bottom-third 1947,1948,1977,1986