1991-2020 Degrees Fahrenheit 1 44.5 47.0 -2.5 26 57 1976 2015 1962 1964 bottom-third 2 49.3 52.4 -3.1 14 69 1976 1975 1952 1964 bottom-third 3 56.0 58.1 -2.1 23 60 1976 2015 1964 1963 bottom-third 1950,1956,1995 4 60.4 62.7 -2.3 23 60 1940 2015 1964 1963 bottom-third 1956 5 63.2 65.8 -2.6 13 70 1940 2016 1962 1964 bottom-third 1950 6 64.4 67.0 -2.6 9 73 1976 2016,2020 1962 1964 bottom-third 1950,2000 7 64.6 66.6 -2.0 18 64 1967 2015 1963 1964 bottom-third 1943,1947,1948,1951,1960,1982 8 62.7 65.0 -2.3 14 68 1967 2010,2015 1962 1964 bottom-third 1984,2000 9 59.9 62.6 -2.7 9 72 1967 2010 1956 1964 bottom-third 10 57.3 59.9 -2.6 12 69 1967 2016 1962 1964 bottom-third 11 54.8 57.4 -2.6 11 70 1967 2020 1963 1964 bottom-third 1948,1963,1981 12 53.3 55.9 -2.6 15 66 1978,1996 2016 1963 1964 bottom-third 1972,1992 18 57.2 59.5 -2.3 13 66 1963 2016 1963 1964 bottom-third 1944,1962,1981 24 53.5 55.8 -2.3 15 63 1963 2017 1964 1961 bottom-third 1969 36 53.3 55.8 -2.5 7 68 1963 2021,2022 1964 1962 bottom-tenth 1968 48 53.1 55.7 -2.6 1 71 1964,1965 2022 1964 1964 lowest 1964 60 53.1 55.7 -2.6 1 68 1965,1967 2020 1965 1964 lowest 1967