1991-2020 Degrees Fahrenheit 1 69.9 73.3 -3.4 14 62 1993 2021 1950 1951 bottom-third 2 67.7 68.9 -1.2 28 48 1993 2021 1951 1952 normal 2010 3 63.7 64.4 -0.7 40 36 1950 1988 1951 1949 normal 1979,1981 4 60.5 59.7 0.8 57 19 1950 1988 1951 1949 top-third 5 54.6 55.4 -0.8 45 31 1951 2012 1951 1949 normal 2014 6 50.1 51.0 -0.9 39 37 1975 2016 1951 1952 normal 1964 7 45.6 47.6 -2.0 31 45 1950 2016 1951 1952 normal 8 42.1 45.0 -2.9 20 55 1950 2016 1951 1952 bottom-third 1997 9 41.1 44.0 -2.9 19 56 1979 2016 1951 1952 bottom-third 10 41.4 44.4 -3.0 15 60 1979 2016 1951 1952 bottom-third 1971 11 42.5 46.0 -3.5 11 64 1979 2016 1951 1952 bottom-third 1975 12 44.5 48.1 -3.6 8 67 1979 2016 1951 1949 bottom-third 18 44.9 49.1 -4.2 2 73 1979 2016 1952 1951 bottom-tenth 24 44.2 48.1 -3.9 3 71 1979 2016 1951 1950 bottom-tenth 1950 36 44.0 48.1 -4.1 1 72 1952 2017 1952 1951 lowest 48 44.2 48.2 -4.0 1 71 1952 2015,2016 1952 1952 lowest 60 -99 48.2 -99 -99 -99 1953 2016 normal