1991-2020 Degrees Fahrenheit 1 67.9 68.1 -0.2 54 31 1976 2004 1939 1940 normal 2 70.8 73.5 -2.7 16 69 1976 2016 1940 1939 bottom-third 3 73.7 77.2 -3.5 4 81 1976 2011 1940 1939 bottom-tenth 4 75.7 79.1 -3.4 3 82 1976 2011 1940 1939 bottom-tenth 1974 5 76.3 79.6 -3.3 4 80 1976 2011 1940 1940 bottom-tenth 6 75.4 78.8 -3.4 3 81 1976 1998 1940 1940 bottom-tenth 7 73.7 77.1 -3.4 3 81 1976 2011 1940 1940 bottom-tenth 8 71.7 74.9 -3.2 2 82 1976 2011 1940 1940 bottom-tenth 9 69.0 72.4 -3.4 1 83 1940 2011 1940 1940 lowest 10 65.5 70.0 -4.5 1 83 1940 2012 1940 1940 lowest 11 64.3 68.2 -3.9 1 83 1940 2016 1940 1940 lowest 12 63.3 67.3 -4.0 1 83 1940 2016 1940 1940 lowest 18 -99 71.1 -99 -99 -99 1977 2012,2016 normal 24 -99 67.3 -99 -99 -99 1961,1979 2017 normal 36 -99 67.3 -99 -99 -99 1961 2018 normal 48 -99 67.2 -99 -99 -99 1961 2018,2019 normal 60 -99 67.2 -99 -99 -99 1962 2019,2020 normal