1991-2020 Degrees Fahrenheit 1 41.8 43.8 -2.0 30 72 1983 2021 1953 1954 bottom-third 1964 2 45.4 48.3 -2.9 18 83 2000 2021 1951 1954 bottom-third 1947,1951 3 51.6 53.7 -2.1 26 75 1976 2021 1952 1954 bottom-third 4 58.2 59.3 -1.1 40 61 1976 2021 1952 1954 normal 1950,1975 5 63.3 64.2 -0.9 38 63 1976 2021 1950 1954 normal 1987,1995,2013 6 67.0 67.7 -0.7 39 62 1976 1954 1950 1954 normal 1927,1937 7 68.6 69.5 -0.9 38 63 1976 2011 1950 1954 normal 1927 8 69.3 69.8 -0.5 45 56 1976 2011 1950 1954 normal 2007 9 69.1 69.0 0.1 67 34 1976 2011 1951 1954 normal 1927,1943,2008 10 67.5 67.6 -0.1 69 32 1976 2011 1952 1954 top-third 1927,1964,2005,2020 11 65.5 65.6 -0.1 68 32 1989 2011 1951 1954 top-third 1981,1991,2003,2020 12 63.5 63.7 -0.2 68 32 1979 2011 1951 1954 top-third 1967,1980 18 65.9 65.0 0.9 88 11 1973 2012 1954 1954 top-third 1954 24 64.4 63.7 0.7 87 12 1979 2012 1953 1954 top-third 1953 36 64.4 63.7 0.7 90 8 1970 2012 1953 1954 top-tenth 2001 48 64.4 63.7 0.7 90 7 1979 2012,2013 1954 1955 top-tenth 60 64.1 63.6 0.5 86 10 1979 2012 1954 1955 top-tenth 1957,2001,2002