1991-2020 Degrees Fahrenheit 1 61.1 59.7 1.4 65 20 1960 2012 1944 1945 top-third 2 56.7 56.1 0.6 62 23 1960 2017 1944 1945 top-third 3 52.9 53.6 -0.7 53 32 1978 2017 1944 1945 normal 1967 4 50.6 52.8 -2.2 33 52 1978 2017 1944 1945 normal 1944,1962,1982 5 52.2 53.7 -1.5 38 47 1978 2017 1945 1946 normal 1965,1996 6 54.3 56.1 -1.8 35 50 1978 2017 1944 1945 normal 1982 7 57.8 59.3 -1.5 37 48 1977 2017 1945 1945 normal 1945,2015 8 60.8 62.5 -1.7 30 55 1977 2017 1944 1945 normal 1942 9 63.1 65.0 -1.9 24 61 1977 2017 1944 1945 bottom-third 1943,1970,1988 10 64.8 66.6 -1.8 21 63 1977 2017 1941 1945 bottom-third 1979,1988 11 65.4 67.4 -2.0 20 64 1977 2017 1941 1945 bottom-third 12 65.5 67.3 -1.8 20 64 1977 2017 1941 1945 bottom-third 1982 18 61.9 63.5 -1.6 26 58 1941 2017 1945 1945 bottom-third 1945,1963 24 65.9 67.3 -1.4 29 54 1978 2017 1943 1945 normal 1976 36 66.0 67.2 -1.2 31 51 1979 2018 1944 1945 normal 1944,1990 48 65.9 67.2 -1.3 27 54 1980 2019 1944 1945 bottom-third 1972 60 65.9 67.2 -1.3 29 51 1962 2020 1945 1946 normal 1950,1966