1991-2020 Degrees Fahrenheit 1 52.0 55.5 -3.5 12 51 1966 2017 1983 1981 bottom-third 2 45.0 50.1 -5.1 1 62 1984 2010 1984 1983 lowest 3 43.3 45.7 -2.4 21 42 1978 2017 1982 1983 bottom-third 4 39.4 42.9 -3.5 11 52 1978 2023 1982 1983 bottom-third 5 37.9 42.0 -4.1 6 57 1978 2012,2023 1982 1983 bottom-tenth 6 39.3 42.7 -3.4 8 52 1970 2002,2012,2023 1982 1983 bottom-third 7 41.7 44.8 -3.1 7 53 1970 2017 1982 1983 bottom-third 2014 8 44.9 47.8 -2.9 8 52 1970 2017 1982 1983 bottom-third 1964,1979 9 48.5 50.9 -2.4 12 48 1970 2017 1982 1983 bottom-third 1967 10 51.4 53.6 -2.2 12 48 1970 2017 1982 1983 bottom-third 1967 11 53.2 55.4 -2.2 11 49 1977 2017 1982 1983 bottom-third 1965,1966,1967,1969,2014 12 53.9 56.1 -2.2 12 48 1977 2017 1982 1983 bottom-third 1967 18 50.2 51.6 -1.4 21 37 1978 2017 1983 1981 normal 1981,2014 24 54.6 56.1 -1.5 17 41 1978 2017 1983 1976 bottom-third 1973 36 54.0 56.1 -2.1 10 46 1970,1979 2023 1982 1983 bottom-third 48 54.1 56.1 -2.0 11 43 1970,1980 2023 1983 1983 bottom-third 1972,1983 60 54.1 56.0 -1.9 10 42 1970,1971,1981 2023 1983 1983 bottom-third 1973,1983