1991-2020 Degrees Fahrenheit 1 14.4 22.0 -7.6 14 72 1983 2015 1942 1941 bottom-third 2 23.6 28.4 -4.8 16 70 1985 2001 1942 1941 bottom-third 3 32.4 35.4 -3.0 15 71 1985 2015 1942 1941 bottom-third 1995 4 38.5 42.5 -4.0 12 74 1985 2015 1942 1941 bottom-third 1950 5 44.9 48.3 -3.4 9 77 1985 2015 1942 1941 bottom-tenth 6 49.4 52.7 -3.3 8 78 1951 2011 1942 1941 bottom-tenth 7 51.9 55.1 -3.2 8 78 1951,1985 2021 1942 1941 bottom-tenth 8 52.4 55.7 -3.3 7 79 1945 2021 1942 1941 bottom-tenth 9 52.4 54.7 -2.3 11 75 1945 2021 1942 1941 bottom-third 1983,2000 10 50.7 52.6 -1.9 19 66 1951 2021 1940 1941 bottom-third 1966,1969,2013 11 48.0 49.7 -1.7 28 57 1950,1951 2012 1940 1941 bottom-third 1971 12 45.6 46.9 -1.3 36 49 1950 2012 1940 1941 normal 1948,1997 18 48.3 48.8 -0.5 56 29 1951 2012 1940 1941 normal 1976,1983 24 46.4 46.9 -0.5 61 23 1951 1999,2012,2017 1941 1942 top-third 1974,2004 36 45.6 46.9 -1.3 46 37 1952 2012,2017 1942 1941 normal 1949 48 45.7 46.9 -1.2 46 36 1952 2018 1942 1942 normal 1944,1949,1983,1994 60 -99 46.9 -99 -99 -99 1951 2002 normal