1991-2020 Degrees Fahrenheit 1 71.9 74.4 -2.5 51 71 1950 2015 1993 1995 normal 1906,1992 2 68.5 72.2 -3.7 28 93 1931 2015 1993 1995 bottom-third 1933,1959,1993,2010 3 66.3 70.4 -4.1 23 97 1958 2023 1978 1995 bottom-third 4 65.4 68.9 -3.5 27 88 1958 2023 1983 1995 bottom-third 1919 5 65.0 68.5 -3.5 26 85 1958 2023 1981 1995 bottom-third 1919 6 65.6 68.9 -3.3 23 86 1958 2023 1981 1995 bottom-third 1906,1919,1971 7 67.5 70.2 -2.7 33 76 1958 2020,2023 1981 1995 bottom-third 1909,1925,1953,1967 8 69.3 71.6 -2.3 42 66 1958 2020 1981 1995 normal 1962 9 70.9 72.9 -2.0 47 61 1958 2020 1981 1995 normal 1933,1950,1952 10 72.0 73.9 -1.9 51 57 1958 2020,2023 1981 1995 normal 1920,1929 11 72.8 74.7 -1.9 53 55 1958 2020,2023 1981 1995 normal 1973 12 73.5 75.0 -1.5 60 48 1958 2020 1984 1995 normal 1976,1983,1984 18 72.0 72.9 -0.9 65 32 1941 2023 1993 1995 top-third 1976,1988,2001 24 74.1 74.9 -0.8 64 32 1941 2021,2023 1993 1995 top-third 1949,1988,1993 36 74.4 74.8 -0.4 60 26 1941 2022 1994 1995 top-third 1987,1994,1997,2005 48 74.3 74.8 -0.5 47 31 1911,1927,1961 2023 1988 1995 normal 1988 60 74.3 74.7 -0.4 43 30 1911 2023 1988 1995 normal