1991-2020 Degrees Fahrenheit 1 59.7 56.9 2.8 68 9 1961 1954 2005 1994 top-third 2 52.4 51.5 0.9 56 21 1975 2012 2005 2003 top-third 1964,1986,2009 3 47.0 47.1 -0.1 47 30 1958 2017 2005 2003 normal 2003 4 46.0 44.1 1.9 67 10 1978 2017 2005 1998 top-third 5 43.5 43.0 0.5 53 24 1978 2017 2005 2002 top-third 1950 6 44.3 43.6 0.7 59 17 1977 2012 2005 2002 top-third 1972,1998,1999 7 46.2 45.5 0.7 57 19 1977 2017 2005 2002 top-third 1985,2000 8 49.2 48.4 0.8 59 16 1977 2017 2005 2002 top-third 2022 9 52.4 51.3 1.1 65 10 1977 2017 2005 1991 top-third 1954,2019 10 54.9 53.7 1.2 67 8 1977 2017 2005 1991 top-third 1954 11 56.6 55.4 1.2 67 8 1977 2017 2005 1992 top-third 1992 12 56.8 56.2 0.6 60 15 1977 2017 2005 1992 top-third 1986 18 52.6 52.0 0.6 63 12 1978 2017 2005 1992 top-third 2019 24 56.6 56.1 0.5 64 10 1978 2017 2005 2000 top-third 1955,2000,2008,2019 36 56.0 56.1 -0.1 46 27 1979 2018 2005 2000 normal 48 55.9 56.1 -0.2 43 29 1980 2019,2020 2005 2005 normal 1976,2000,2003,2005,2007 60 56.1 56.1 0.0 48 23 1981 2020 2005 1995 top-third 1955,1976,2014