1991-2020 Degrees Fahrenheit 1 40.6 34.8 5.8 85 7 1960 2012 1944 1945 top-tenth 2 32.6 28.6 4.0 79 13 1960 2012 1944 1935 top-third 3 28.3 25.1 3.2 82 10 1936 2012 1944 1945 top-third 1998 4 26.6 24.4 2.2 75 16 1936 2012 1944 1945 top-third 5 28.5 26.5 2.0 78 13 1936 2012 1944 1945 top-third 1998 6 32.3 30.4 1.9 79 12 1936 2012 1944 1945 top-third 1964,1998 7 36.3 35.2 1.1 73 17 1936 2012 1944 1942 top-third 8 40.4 39.8 0.6 69 21 1936 2012 1944 1942 top-third 1995 9 43.8 43.7 0.1 58 32 1936 2012 1944 1942 normal 1995 10 46.3 46.3 0.0 56 34 1936 2012 1944 1942 normal 1953 11 47.9 47.5 0.4 65 25 1936 2012 1944 1942 top-third 1998 12 47.5 47.5 0.0 59 31 1936 2012 1944 1942 normal 1974,1998,2020 18 41.8 41.8 0.0 63 26 1979 2017 1944 1942 top-third 1954,1955,2004 24 47.3 47.5 -0.2 58 30 1952 2017 1941 1942 normal 1955,1977,2001,2002 36 -99 47.5 -99 -99 -99 1952 2017,2018 normal 48 -99 47.5 -99 -99 -99 1952 2018 normal 60 -99 47.5 -99 -99 -99 1997 2006 normal