1991-2020 Degrees Fahrenheit 1 54.8 56.9 -2.1 23 44 1960 2003 1975 1976 normal 1957 2 54.7 56.0 -1.3 21 42 1972 2018 1975 1976 bottom-third 1957,1987 3 57.7 58.7 -1.0 26 37 1973 2018 1975 1976 normal 1961,1987,2012 4 61.9 63.2 -1.3 19 43 1972 2018 1975 1976 bottom-third 1969 5 66.0 68.3 -2.3 8 54 1972 1996 1973 1976 bottom-third 6 70.1 72.6 -2.5 4 58 1973 1996 1973 1976 bottom-tenth 1983,1987 7 73.1 75.7 -2.6 4 58 1972,1973 1996,2018 1973 1976 bottom-tenth 1987 8 74.9 77.3 -2.4 5 57 1972 2018 1973 1976 bottom-tenth 9 75.4 77.6 -2.2 6 56 1972 2018 1973 1976 bottom-tenth 10 74.7 77.1 -2.4 5 57 1972 2018 1976 1976 bottom-tenth 1976 11 73.6 76.1 -2.5 5 57 1972 2018 1976 1975 bottom-tenth 12 72.6 74.8 -2.2 6 56 1972 2018 1976 1975 bottom-tenth 18 72.2 74.1 -1.9 7 50 1972 2018 1976 1975 bottom-third 24 72.4 74.9 -2.5 3 54 1966 2018 1973 1976 bottom-tenth 1973 36 72.8 74.9 -2.1 5 47 1972,1974 2018 1976 1976 bottom-tenth 1968,1976 48 72.8 74.9 -2.1 5 42 1968,1974 2018 1975 1976 bottom-tenth 1975 60 72.8 74.8 -2.0 3 39 1974,1976 2018,2019 1976 1975 bottom-tenth 1969,1972,1973,1975