1991-2020 Degrees Fahrenheit 1 17.5 30.4 -12.9 2 100 1934 2017 1934 1978 bottom-tenth 2 21.3 29.3 -8.0 5 95 1978 2023 1978 1977 bottom-tenth 3 24.4 30.6 -6.2 10 90 1963 2023 1978 1976 bottom-tenth 4 28.6 33.4 -4.8 11 87 1977 1932 1978 1976 bottom-third 5 32.9 37.3 -4.4 12 85 1977 1932 1978 1976 bottom-third 1948 6 37.6 41.8 -4.2 10 87 1977 1932 1978 1976 bottom-tenth 7 42.3 46.1 -3.8 11 86 1977 1932,2017 1978 1976 bottom-third 8 45.7 49.5 -3.8 7 90 1977 2023 1977 1978 bottom-tenth 9 48.2 51.6 -3.4 9 88 1977 2017 1978 1976 bottom-tenth 1961 10 49.1 52.5 -3.4 9 88 1977 2016 1977 1978 bottom-tenth 1959,1961 11 49.0 52.2 -3.2 8 89 1977 2020 1977 1978 bottom-tenth 1948 12 47.7 51.1 -3.4 8 89 1941 2017,2020 1977 1978 bottom-tenth 1934 18 44.2 48.0 -3.8 2 91 1941 2017 1941 1978 bottom-tenth 24 48.2 51.0 -2.8 6 87 1941 2017,2023 1978 1977 bottom-tenth 1942,1945,1964 36 47.9 51.0 -3.1 1 88 1979 2022,2023 1979 1978 lowest 48 48.4 50.9 -2.5 3 83 1964,1980 2023 1971 1978 bottom-tenth 1941,1971 60 48.6 50.9 -2.3 6 77 1944,1945,1965 2023 1972 1978 bottom-tenth 1942,1948,1968,1972,1980,1981