1991-2020 Degrees Fahrenheit 1 44.8 45.4 -0.6 44 41 1960 2012 1941 1942 normal 2 38.5 41.6 -3.1 22 63 2015 2012 1941 1942 bottom-third 2003 3 36.6 39.5 -2.9 24 61 1940 2012 1941 1942 bottom-third 1962 4 37.5 39.6 -2.1 36 49 1978 2012 1941 1942 normal 1955,2004,2011 5 39.7 41.2 -1.5 35 49 1940 2012 1941 1942 normal 1947,1980,2011 6 43.6 44.1 -0.5 52 32 1977 2012 1941 1942 normal 1975,2005 7 47.5 47.8 -0.3 55 29 1977 2012 1941 1942 normal 1957,1997,2005 8 50.9 51.5 -0.6 51 33 1977 2012 1941 1942 normal 1946,1957,1983,1997,2010 9 53.8 54.6 -0.8 50 34 1977 2012 1941 1942 normal 1985 10 55.7 56.6 -0.9 46 37 1977 2012 1941 1942 normal 1987 11 56.6 57.4 -0.8 50 33 1977 2012 1941 1942 normal 1960,1990 12 56.7 57.3 -0.6 55 28 1941,1977 2012 1941 1942 normal 1960 18 51.1 52.9 -1.8 22 60 1941 2017 1941 1942 bottom-third 1945,1957 24 55.1 57.2 -2.1 8 73 1978 2012,2013 1942 1942 bottom-tenth 1965,1979,1982 36 -99 57.2 -99 -99 -99 1979 2013 normal 48 -99 57.2 -99 -99 -99 1980 2023 normal 60 -99 57.1 -99 -99 -99 1966,1967,1968,1981 2020 normal