1991-2020 Degrees Fahrenheit 1 25.0 41.6 -16.6 2 115 1912 2012 1912 1957 bottom-tenth 2 28.5 37.0 -8.5 5 111 1912 2017 1948 1957 bottom-tenth 3 29.3 34.7 -5.4 15 99 1912 1986 1949 1957 bottom-third 4 31.2 33.7 -2.5 40 73 1912 2000 1955 1957 normal 2019 5 32.3 34.9 -2.6 35 78 1912 2000 1956 1957 bottom-third 1940,2007 6 35.5 37.7 -2.2 33 80 1912 2000 1952 1957 bottom-third 1896,1965,1988 7 39.3 41.7 -2.4 24 87 1912 2016 1952 1957 bottom-third 1927,1944,1947,1979 8 43.8 45.7 -1.9 29 82 1912 2016 1952 1957 bottom-third 1918,1927,1942,1965,1966 9 47.5 49.1 -1.6 35 76 1912 2016 1952 1957 bottom-third 1966,2019 10 49.5 51.2 -1.7 27 83 1912 1935 1952 1957 bottom-third 1918,1966,1979,1985 11 50.1 52.0 -1.9 21 88 1912 1935 1952 1957 bottom-third 1949,1979 12 49.7 51.7 -2.0 20 89 1912 1935 1952 1957 bottom-third 1948,1985,1996 18 45.5 47.1 -1.6 25 82 1916 1935 1952 1957 bottom-third 1969 24 50.8 51.7 -0.9 42 64 1917 1935 1953 1957 normal 1943,1961,1966,1978,1986 36 51.1 51.7 -0.6 48 56 1917,1918 2017 1954 1957 normal 1954,1963,1968,1972 48 51.4 51.7 -0.3 64 38 1918 2018 1955 1957 normal 1939,1943,1955,1983 60 51.5 51.7 -0.2 68 32 1925 2017 1956 1957 top-third 2012