1991-2020 Degrees Fahrenheit 1 46.2 52.7 -6.5 6 87 1947 1982 1947 1953 bottom-tenth 2 42.0 46.3 -4.3 6 87 1947 2010 1950 1953 bottom-tenth 3 35.6 40.0 -4.4 8 85 1950 2010 1950 1953 bottom-tenth 1940 4 33.1 34.6 -1.5 38 55 1934 2010 1950 1953 normal 1995,2022 5 28.9 31.0 -2.1 31 62 1934 2012 1950 1953 bottom-third 6 28.3 29.9 -1.6 37 54 2014 2012 1950 1952 normal 1946 7 29.9 30.7 -0.8 60 31 1934 2012 1952 1949 normal 1986,1992 8 32.5 32.7 -0.2 67 24 1934 2012 1952 1949 top-third 1958 9 35.1 35.6 -0.5 63 28 1934 2012 1952 1949 top-third 1969,1980,1986,1988 10 38.2 38.7 -0.5 66 25 1934 2012 1952 1949 top-third 1984,2018 11 40.6 41.2 -0.6 63 28 1934 2012 1952 1949 top-third 1942,1976,2005 12 42.2 42.9 -0.7 61 30 1934 2012 1952 1949 top-third 18 -99 38.5 -99 -99 -99 2015 1999 normal 24 -99 42.8 -99 -99 -99 1935 2017 normal 36 -99 42.8 -99 -99 -99 1936 2000 normal 48 -99 42.9 -99 -99 -99 1937 2013 normal 60 -99 42.8 -99 -99 -99 1938 2002 normal