1991-2020 Degrees Fahrenheit 1 31.8 40.3 -8.5 8 77 1989 2015 1942 1941 bottom-tenth 1960 2 39.3 44.8 -5.5 10 75 1989 2015 1942 1941 bottom-third 3 45.8 49.8 -4.0 10 75 1976 2015 1942 1941 bottom-third 4 51.5 55.1 -3.6 12 72 1976 2015 1940 1941 bottom-third 5 56.0 59.7 -3.7 8 76 1962 2015 1940 1941 bottom-tenth 6 59.5 62.9 -3.4 8 76 1962 2015 1940 1941 bottom-tenth 7 61.2 64.4 -3.2 7 77 1962 2015 1940 1941 bottom-tenth 8 61.6 64.4 -2.8 11 73 1940,1958 2015 1940 1941 bottom-third 1972 9 60.8 63.2 -2.4 15 69 1940 2015 1940 1941 bottom-third 1944,1976,2000 10 59.0 61.2 -2.2 18 66 1940 2010 1940 1941 bottom-third 1965 11 56.3 59.0 -2.7 13 71 1940 2012 1940 1941 bottom-third 1956,1960,1992 12 54.1 56.9 -2.8 12 72 1940 2012 1940 1941 bottom-third 18 56.7 58.9 -2.2 21 62 1963 2016 1941 1942 bottom-third 1969,1979,1981 24 54.5 56.9 -2.4 14 69 1941 2021 1941 1942 bottom-third 1958 36 53.7 56.9 -3.2 1 81 1942 2012 1942 1942 lowest 48 -99 56.9 -99 -99 -99 1943 2013 normal 60 -99 56.8 -99 -99 -99 1944 2020 normal