1991-2020 Degrees Fahrenheit 1 81.7 83.5 -1.8 11 56 1974 1977 1993 1992 bottom-third 1990 2 85.4 86.7 -1.3 19 48 1971 2019 1992 1993 bottom-third 2020 3 87.0 87.7 -0.7 25 42 1976 1951 1992 1993 normal 1989 4 87.7 87.6 0.1 42 25 1971 1951 1993 1982 normal 2013,2016,2017,2021 5 86.3 86.5 -0.2 40 27 1976 1998 1993 1989 normal 2013,2021 6 84.4 84.6 -0.2 40 26 1976 2011 1993 1989 normal 1984,1986,1999 7 82.1 82.2 -0.1 40 26 1987 2011 1993 1989 normal 1999 8 79.4 79.5 -0.1 42 23 1987 2000 1993 1986 normal 1967,1984 9 76.9 76.8 0.1 45 20 1987 2000 1993 1986 top-third 2016,2019 10 75.1 74.7 0.4 47 18 1968 2000 1993 1980 top-third 2016 11 73.7 73.7 0.0 40 25 1987 2000 1993 1989 normal 1967,1972,1974 12 73.7 73.8 -0.1 38 27 1968,1987 2000 1993 1989 normal 1972 18 77.0 77.4 -0.4 37 27 1977 2000 1993 1989 normal 24 73.5 73.8 -0.3 40 23 1971,1988 2000 1993 1986 normal 2014 36 73.1 73.8 -0.7 24 37 1970 2000 1993 1993 normal 1984,1993,2003,2005 48 73.2 73.7 -0.5 27 32 1971 1955,2001,2019 1993 1991 normal 1986,1991 60 73.1 73.7 -0.6 24 33 1979 1956,2002,2020 1992 1993 normal