1991-2020 Degrees Fahrenheit 1 51.3 45.1 6.2 103 5 2018 1915 1940 1915 top-tenth 2 39.2 38.2 1.0 74 34 1965 2012 1940 1938 top-third 1918,1963 3 30.8 31.7 -0.9 60 48 1965,2014 2012 1940 1938 normal 1995 4 27.2 27.4 -0.2 65 42 1979 2012 1940 1938 normal 1958 5 25.9 26.0 -0.1 69 38 1979 2012 1940 1938 normal 1980 6 26.2 27.2 -1.0 57 50 1979 2012 1940 1938 normal 1933,2022 7 29.8 30.2 -0.4 66 41 1979 2012 1940 1935 normal 8 33.9 34.0 -0.1 73 33 1979 2012 1940 1934 top-third 1946,1980 9 37.6 37.8 -0.2 66 39 1979 2012 1940 1938 normal 1958,1961,1985,1992 10 41.1 41.1 0.0 69 36 1979 2012 1940 1938 normal 2013 11 43.6 43.4 0.2 71 34 1979 2012 1940 1938 top-third 1949,1957,1958 12 44.6 44.6 0.0 68 37 1979 2012 1939 1940 normal 1980,1983,2008 18 38.2 38.8 -0.6 59 45 1918 2017 1938 1940 normal 1947 24 44.8 44.6 0.2 76 26 1918 2017 1940 1935 top-third 1954 36 44.7 44.6 0.1 75 24 1918 2017 1939 1940 top-third 1992,2005 48 44.7 44.6 0.1 73 24 1980 1934 1940 1935 top-third 1990,1992 60 44.5 44.6 -0.1 70 25 1997 1935 1940 1936 top-third 1936,1943,1992,2022