1991-2020 Degrees Fahrenheit 1 38.1 38.3 -0.2 41 36 1978 1976 2008 2005 normal 2 34.6 36.7 -2.1 29 48 1978 1949 2007 2008 normal 3 35.8 37.5 -1.7 32 45 1977 1949 2004 2008 normal 4 37.7 39.7 -2.0 24 52 1977 1949 2003 2008 bottom-third 1951 5 41.3 43.2 -1.9 19 57 1977 2017 2003 2008 bottom-third 2001 6 46.2 47.4 -1.2 28 47 1977 2017 2007 2008 normal 1984 7 50.0 51.3 -1.3 20 55 1977 2017 2004 2008 bottom-third 1969,2004 8 53.0 54.3 -1.3 18 57 1977 2017 2004 2008 bottom-third 9 55.3 56.3 -1.0 23 52 1977 2017 2004 2008 bottom-third 1951,1969 10 55.9 57.2 -1.3 15 60 1977 2017 2004 2008 bottom-third 1961,1979 11 56.0 57.2 -1.2 20 55 1977 2017 2004 2008 bottom-third 1979,1990 12 55.2 56.3 -1.1 23 52 1977 2017 2004 2008 bottom-third 1980,1997,2004 18 53.1 53.3 -0.2 41 33 1978 2017 2007 2008 normal 1956,2007 24 56.5 56.2 0.3 55 19 1978 2017 2007 2008 top-third 1972,1988,2022 36 56.1 56.2 -0.1 46 27 1979 2018 2006 2008 normal 1957,1975,1991,2000,2006 48 56.2 56.2 0.0 48 24 1980 2020 2007 2008 top-third 1976,1987,1990,1991,2002 60 56.3 56.2 0.1 53 18 1981 2020 2008 2008 top-third 1958,1975,1976,1991,1994,2008,2013