1991-2020 Degrees Fahrenheit 1 63.2 66.0 -2.8 35 52 1973 2004 1944 1943 normal 2 58.9 62.8 -3.9 18 68 1964 2015 1944 1943 bottom-third 1962 3 -99 60.7 -99 -99 -99 1949 2015 normal 4 -99 59.4 -99 -99 -99 1949 2015 normal 5 -99 60.5 -99 -99 -99 1949 2015,2018 normal 6 -99 63.2 -99 -99 -99 1949 2018 normal 7 -99 66.9 -99 -99 -99 1973 2018 normal 8 -99 70.3 -99 -99 -99 1942,1973 2018 normal 9 -99 73.0 -99 -99 -99 1942 2018,2021 normal 10 -99 74.8 -99 -99 -99 1942 2018 normal 11 -99 75.4 -99 -99 -99 1942 2021 normal 12 -99 75.2 -99 -99 -99 1942 2018,2021 normal 18 -99 71.2 -99 -99 -99 1942 2018 normal 24 -99 75.2 -99 -99 -99 1943,1966 2022 normal 36 -99 75.2 -99 -99 -99 1944 2018 normal 48 -99 75.2 -99 -99 -99 1975,1976 2018 normal 60 -99 75.1 -99 -99 -99 1976,1977 2018 normal