1991-2020 Degrees Fahrenheit 1 57.8 57.0 0.8 73 21 1958 2017 2019 2020 top-third 1963 2 49.8 53.1 -3.3 22 72 1958 2017 2010 2020 bottom-third 3 47.9 50.3 -2.4 35 57 1958 2017 2015 2020 normal 1939,1951,1955 4 47.3 49.1 -1.8 40 52 1964 2017 2015 2020 normal 2002,2014,2015 5 49.6 49.9 -0.3 62 30 1958 2017 2019 2020 top-third 1943,1991 6 52.3 52.5 -0.2 65 27 1977 2017 2019 2020 top-third 1938 7 55.3 55.7 -0.4 63 29 1977 2017 2019 2020 top-third 1954,1955,1991 8 59.1 59.0 0.1 69 23 1977 2017 2019 2020 top-third 1950 9 62.3 61.7 0.6 77 15 1977 2017 2019 2020 top-third 10 64.3 63.7 0.6 77 15 1977 2017 2019 2020 top-third 11 65.4 64.6 0.8 79 12 1977 1999 2019 2020 top-third 12 65.4 64.7 0.7 79 12 1977 2017 2019 2020 top-third 18 61.4 60.6 0.8 81 9 1977 2017 2020 2019 top-tenth 2019 24 65.6 64.7 0.9 82 7 1977 2000 2020 2018 top-tenth 36 65.4 64.6 0.8 79 8 1977 2018 2020 2020 top-tenth 2000,2020,2022 48 65.4 64.6 0.8 79 6 1977 2019,2020 2017 2020 top-tenth 60 65.8 64.5 1.3 82 1 1977 2020,2021 2020 2020 highest 2020