1991-2020 Degrees Fahrenheit 1 35.2 41.6 -6.4 24 93 1912 2012 1937 1942 bottom-third 1975 2 36.2 37.0 -0.8 69 47 1912 2017 1942 1940 normal 3 34.0 34.7 -0.7 75 39 1912 1986 1942 1938 normal 1896 4 33.1 33.7 -0.6 76 37 1912 2000 1942 1938 top-third 1931 5 34.4 34.9 -0.5 73 40 1912 2000 1942 1938 normal 1982 6 37.5 37.7 -0.2 78 35 1912 2000 1942 1938 top-third 1953 7 41.0 41.7 -0.7 65 46 1912 2016 1942 1941 normal 1940,1951,2013,2021 8 45.1 45.7 -0.6 64 47 1912 2016 1942 1941 normal 1982,1989 9 48.6 49.1 -0.5 64 47 1912 2016 1942 1941 normal 1945 10 50.5 51.2 -0.7 60 50 1912 1935 1942 1941 normal 1946 11 51.2 52.0 -0.8 53 56 1912 1935 1942 1941 normal 1926,1937,1959,1982 12 51.3 51.7 -0.4 63 46 1912 1935 1942 1941 normal 1926,1972 18 45.9 47.1 -1.2 39 68 1916 1935 1937 1942 normal 1926,1951,1961,1978 24 50.8 51.7 -0.9 42 64 1917 1935 1937 1942 normal 1958,1961,1966,1978,1986 36 51.2 51.7 -0.5 58 46 1917,1918 2017 1938 1942 normal 1938,1967,1976,1981,1987 48 51.4 51.7 -0.3 64 38 1918 2018 1939 1942 normal 1939,1955,1958,1983 60 51.6 51.7 -0.1 70 30 1925 2017 1940 1942 top-third 1940