1991-2020 Degrees Fahrenheit 1 54.3 55.7 -1.4 42 37 1954 2015 1999 2001 normal 1983 2 54.0 54.7 -0.7 46 32 1948 2015 2001 2000 normal 1963 3 52.5 53.7 -1.2 43 35 1949 2015 2001 2000 normal 2012 4 52.4 53.1 -0.7 47 31 1949 2015 2001 2000 normal 1987 5 53.5 53.8 -0.3 51 27 1949 2015 2001 2000 normal 1987 6 55.0 55.3 -0.3 51 27 1949 2015 2001 2000 normal 2006,2009,2011 7 56.2 56.8 -0.6 48 30 1949 2015 2001 2000 normal 8 57.1 57.8 -0.7 47 31 1949 2015 2001 2000 normal 2006 9 57.8 58.5 -0.7 45 32 1949 2015 2001 2000 normal 10 58.3 58.9 -0.6 45 31 1949 2015 2001 2000 normal 2023 11 58.8 59.0 -0.2 54 22 1949 2015 2001 1998 top-third 1980,1991,2011 12 58.4 58.9 -0.5 48 28 1949 2015 2001 1998 normal 2009,2023 18 56.8 57.7 -0.9 43 32 1949,1950 2016 2000 2001 normal 2009 24 58.2 58.8 -0.6 42 32 1950 2016 2001 1999 normal 1999 36 58.1 58.8 -0.7 39 33 1950 2016,2017 2001 2000 normal 1984,2000,2009 48 57.8 58.8 -1.0 30 40 1952 2018 1983 2001 normal 1981,1983 60 58.2 58.7 -0.5 39 29 1952,1953,1956 2018 1986 2001 normal 1986,2012,2013