1991-2020 Degrees Fahrenheit 1 68.1 71.9 -3.8 8 68 1982 1952 1958 1960 bottom-tenth 2 62.8 67.6 -4.8 1 75 1961 1991,2018 1961 1960 lowest 3 57.7 62.8 -5.1 1 75 1961 1991 1961 1960 lowest 4 54.7 57.5 -2.8 8 68 1960 2012 1960 1959 bottom-tenth 5 51.3 52.5 -1.2 26 50 1978 2012 1960 1959 normal 1983,2007 6 46.7 48.7 -2.0 15 61 1978 2012,2017 1960 1959 bottom-third 1971 7 43.7 46.7 -3.0 6 69 1978 2012 1961 1960 bottom-tenth 1982 8 43.9 46.3 -2.4 12 63 1978 2012 1951 1960 bottom-third 2014 9 45.2 47.3 -2.1 13 62 1978 2012 1958 1960 bottom-third 2014 10 47.5 49.3 -1.8 16 59 1977,1978 2017 1958 1960 bottom-third 1989 11 50.1 51.5 -1.4 21 54 1977 2017 1958 1960 bottom-third 12 51.9 53.5 -1.6 17 58 1977 2017 1958 1960 bottom-third 1997 18 50.1 51.9 -1.8 10 65 1979 2017 1959 1960 bottom-third 1970,1996 24 52.4 53.5 -1.1 18 56 1978 2017 1959 1960 bottom-third 1952,1962 36 52.4 53.4 -1.0 20 53 1979 2018 1960 1959 bottom-third 1971,1983 48 52.2 53.4 -1.2 12 60 1980 2019 1961 1960 bottom-third 1966,1983 60 52.5 53.4 -0.9 20 51 1981 2020 1961 1960 bottom-third 1968,1969,1998