1991-2020 Degrees Fahrenheit 1 31.5 32.5 -1.0 44 33 1977 2023 1939 1939 normal 2 -99 34.9 -99 -99 -99 1961 2002 normal 3 -99 38.7 -99 -99 -99 1977 2002,2016 normal 4 -99 43.3 -99 -99 -99 1977 2002 normal 5 -99 48.6 -99 -99 -99 1977 2016 normal 6 -99 53.2 -99 -99 -99 1977 2016 normal 7 -99 56.7 -99 -99 -99 1977 2017 normal 8 -99 58.8 -99 -99 -99 1977 2017 normal 9 -99 59.4 -99 -99 -99 1977 2016 normal 10 -99 58.9 -99 -99 -99 1977 2016 normal 11 -99 57.5 -99 -99 -99 1977 2017 normal 12 -99 55.6 -99 -99 -99 1968 2013 normal 18 -99 54.7 -99 -99 -99 1941,1964,1968 2017 normal 24 -99 55.5 -99 -99 -99 1964,1968 2013 normal 36 -99 55.5 -99 -99 -99 1963,1965 2023 normal 48 -99 55.5 -99 -99 -99 1964 2023 normal 60 -99 55.5 -99 -99 -99 1965,1968 2023 normal