1991-2020 Degrees Fahrenheit 1 33.5 35.1 -1.6 40 37 1977 1950 1985 1986 normal 2 35.2 37.0 -1.8 33 44 1977 1950 1986 1985 normal 1958 3 39.1 40.1 -1.0 34 42 1977 2016 1985 1986 normal 1975 4 43.9 44.3 -0.4 40 36 1977 1972 1984 1986 normal 1980,2000 5 49.2 49.1 0.1 48 27 1977 1972 1985 1986 normal 1952 6 53.0 53.4 -0.4 42 33 1977 2017 1984 1986 normal 7 56.6 56.6 0.0 48 27 1977 2017 1985 1986 normal 8 58.6 58.5 0.1 48 27 1977 2017 1985 1986 normal 1988 9 59.4 59.2 0.2 49 26 1977 2017 1985 1986 normal 1991 10 59.3 59.0 0.3 55 20 1977 2020 1985 1986 top-third 1971,2007,2022 11 58.1 57.8 0.3 55 20 1977 2017 1985 1986 top-third 1953,1988,1991,2006 12 56.6 56.2 0.4 59 16 1977 2017 1986 1986 top-third 1953,1986,2005,2006,2023 18 55.8 55.2 0.6 63 11 1978 2017 1986 1954 top-third 2006,2007 24 56.6 56.1 0.5 63 11 1964 2013 1986 1954 top-third 2006,2022 36 56.2 56.1 0.1 53 20 1970 2019 1986 1955 top-third 48 55.8 56.1 -0.3 38 34 1964 2020 1986 1975 normal 1958,1975,2003 60 55.7 56.0 -0.3 33 38 1981 2021 1986 1976 normal 1976