1991-2020 Degrees Fahrenheit 1 79.2 81.5 -2.3 9 67 1950 2000 1958 1957 bottom-third 2 78.5 80.6 -2.1 7 69 1961 2011 1956 1958 bottom-tenth 1964,1965,1966,1979 3 77.1 78.4 -1.3 24 52 1961 2022 1958 1957 bottom-third 1993 4 73.8 75.4 -1.6 14 62 1961 2022 1956 1958 bottom-third 1992 5 70.2 72.4 -2.2 9 67 1983 2015 1950 1958 bottom-third 6 67.5 69.4 -1.9 17 59 1958,1983 2012 1958 1957 bottom-third 2014 7 64.5 66.7 -2.2 15 61 1978 2012 1958 1957 bottom-third 1996 8 62.6 65.0 -2.4 14 61 1978 2012 1958 1957 bottom-third 9 62.3 64.3 -2.0 19 56 1978 2017 1958 1957 bottom-third 10 62.7 64.7 -2.0 16 59 1977 2017 1958 1957 bottom-third 1963,1971,1973,2014 11 64.0 65.9 -1.9 16 59 1977 2017 1958 1957 bottom-third 1981 12 65.2 67.2 -2.0 14 61 1977 2017 1958 1957 bottom-third 18 65.4 67.9 -2.5 6 69 1984 2017 1959 1958 bottom-tenth 24 64.5 67.1 -2.6 4 70 1978 2017 1959 1958 bottom-tenth 1977 36 65.5 67.1 -1.6 19 54 1970,1978,1979 2018 1959 1958 bottom-third 48 65.6 67.0 -1.4 22 50 1971 2019,2020 1959 1958 bottom-third 1973 60 65.8 67.0 -1.2 24 47 1970 2020 1959 1958 normal 1986,1987,1988,1996