1991-2020 Degrees Fahrenheit 1 48.2 41.9 6.3 70 5 1950 1987 1951 1952 top-tenth 2 32.0 36.3 -4.3 17 58 1950 2012 1951 1949 bottom-third 3 27.5 30.8 -3.3 26 49 2019 2012 1951 1952 normal 4 22.1 27.3 -5.2 16 59 1950 1992 1951 1952 bottom-third 1969,1975,2009 5 18.8 25.9 -7.1 9 65 1950 1992 1951 1952 bottom-third 6 19.6 26.7 -7.1 6 68 1979 2000 1951 1949 bottom-tenth 7 22.7 29.2 -6.5 5 69 1950 2000,2012 1951 1949 bottom-tenth 8 26.4 32.9 -6.5 3 71 1950 2012 1950 1951 bottom-tenth 9 30.6 36.9 -6.3 2 72 1965 2012 1952 1951 bottom-tenth 10 34.4 40.2 -5.8 1 73 1952 1999,2012 1952 1951 lowest 11 36.4 42.3 -5.9 1 72 1952 2012 1952 1951 lowest 12 37.9 43.2 -5.3 1 72 1951,1952 1981 1951 1951 lowest 1951 18 31.4 37.7 -6.3 2 70 1951 2000 1951 1950 bottom-tenth 24 37.9 43.2 -5.3 1 70 1952 2000 1952 1951 lowest 36 38.3 43.2 -4.9 1 68 1952 2000 1952 1952 lowest 48 -99 43.2 -99 -99 -99 1953 2001 normal 60 -99 43.3 -99 -99 -99 1954 1992 normal