1991-2020 Degrees Fahrenheit 1 63.6 64.4 -0.8 27 49 1993 1954 1950 1951 normal 2 60.0 61.1 -1.1 26 50 1960 2012 1950 1951 normal 1956,1988 3 57.4 57.8 -0.4 41 35 1960 2017 1951 1949 normal 1985,2008 4 56.7 55.3 1.4 61 14 1978 2017 1951 1950 top-third 5 55.6 54.2 1.4 61 14 1978 2017 1951 1950 top-third 6 54.9 54.5 0.4 54 20 1977 2017 1951 1950 top-third 1997 7 56.8 56.1 0.7 57 17 1977 2017 1951 1950 top-third 1986,1995 8 59.4 58.6 0.8 59 15 1977 2017 1951 1950 top-third 9 62.0 61.2 0.8 62 12 1968,1977 2017 1951 1952 top-third 1955,1972,2021 10 64.0 63.3 0.7 60 14 1968 2017 1951 1952 top-third 11 65.5 64.8 0.7 62 12 1968 2017 1951 1952 top-third 2021,2022 12 66.0 65.4 0.6 63 11 1968,1977 2017 1951 1950 top-third 1950,2021 18 61.5 61.8 -0.3 45 27 1970 2017 1951 1952 normal 1990 24 65.2 65.4 -0.2 46 26 1969 2017 1951 1952 normal 1956,1986 36 65.4 65.3 0.1 56 14 1970 2018,2019 1952 1952 top-third 1956,1987,1991,1992,1999,2000,2007,2008 48 -99 65.3 -99 -99 -99 1971 2020 normal 60 -99 65.3 -99 -99 -99 1970 2020 normal