1991-2020 Degrees Fahrenheit 1 30.2 34.3 -4.1 26 59 1977 2023 1942 1943 bottom-third 2 30.8 37.2 -6.4 8 77 1977 2016 1943 1942 bottom-tenth 3 36.0 41.0 -5.0 10 75 1977 2016 1940 1942 bottom-third 4 41.6 45.7 -4.1 12 73 1977 2016 1941 1942 bottom-third 1941,1961 5 46.9 50.6 -3.7 10 74 1977 2016 1941 1942 bottom-third 1948,1961,1978 6 51.4 55.1 -3.7 10 74 1977 2016 1941 1942 bottom-third 7 55.0 58.5 -3.5 9 75 1977 2016 1941 1942 bottom-third 1946,1959,1961 8 56.9 60.3 -3.4 9 75 1977 2016 1941 1942 bottom-third 1945 9 57.8 60.6 -2.8 12 72 1977 2016 1941 1942 bottom-third 1945 10 57.3 59.9 -2.6 15 69 1941 2016 1941 1942 bottom-third 11 56.0 58.4 -2.4 18 66 1941 2017 1941 1942 bottom-third 12 53.8 56.5 -2.7 14 70 1941 2017 1941 1942 bottom-third 1944,1964 18 53.8 56.0 -2.2 23 60 1964,1979 2017 1942 1943 bottom-third 1951,1962,1977 24 54.2 56.5 -2.3 20 63 1969 2017,2022 1942 1943 bottom-third 1966 36 53.5 56.4 -2.9 2 80 1970 2023 1943 1943 bottom-tenth 48 -99 56.4 -99 -99 -99 1944 2023 normal 60 -99 56.3 -99 -99 -99 1945 2021,2023 normal