1991-2020 Degrees Fahrenheit 1 21.6 29.3 -7.7 15 115 1934 2018 1936 1957 bottom-third 2 24.8 28.2 -3.4 42 88 1904 2023 1948 1957 bottom-third 3 28.7 29.8 -1.1 86 43 1918 2016 1957 1954 top-third 4 32.3 33.0 -0.7 87 41 1918 2012,2016 1957 1954 top-third 5 36.1 37.0 -0.9 84 44 1905,1918 2012,2023 1956 1957 normal 1967 6 40.8 41.5 -0.7 93 35 1918 2012,2016 1957 1954 top-third 1980 7 44.6 45.7 -1.1 85 43 1905 2016,2023 1957 1954 normal 8 48.0 49.0 -1.0 88 40 1905 2023 1957 1954 top-third 1985,2014 9 50.2 50.9 -0.7 95 33 1904 2023 1957 1954 top-third 1976,1985,2014 10 50.9 51.5 -0.6 95 33 1918 2023 1957 1954 top-third 1974,1997 11 50.6 51.1 -0.5 99 29 1918 2023 1957 1954 top-third 1960 12 49.4 49.9 -0.5 99 29 1918 2023 1957 1954 top-third 1949,1998 18 46.2 47.0 -0.8 94 32 1905 2017 1957 1955 top-third 1955,1985 24 48.4 49.8 -1.4 77 49 1918 2023 1957 1955 normal 1948,1980,1987 36 48.4 49.8 -1.4 72 52 1918 2023 1957 1956 normal 1939,1948,1960,1975,1978,2005 48 48.3 49.7 -1.4 68 54 1920 2023 1948 1957 normal 1932,1948,1974,1980 60 48.7 49.7 -1.0 80 40 1908 2023 1949 1957 top-third 1978,1985,1989,1990,1997