1991-2020 Degrees Fahrenheit 1 41.9 44.4 -2.5 31 66 2019 1934 1967 1969 bottom-third 1989 2 39.9 41.2 -1.3 43 54 1936 2015 1969 1968 normal 1928,2006 3 36.8 39.1 -2.3 35 62 1950 1934 1969 1968 normal 1938,1965,1996 4 35.9 37.8 -1.9 36 60 1949 1934 1969 1968 normal 1962 5 37.1 38.4 -1.3 41 55 1949 1934 1969 1968 normal 6 38.8 40.5 -1.7 34 62 1949 1934 1969 1968 normal 2009 7 42.3 43.8 -1.5 39 57 1949 2015 1969 1968 normal 8 45.6 47.3 -1.7 34 62 1949 2015 1969 1968 normal 2017 9 48.4 50.2 -1.8 32 64 1949 2015 1969 1968 bottom-third 1980 10 50.4 51.6 -1.2 40 56 1949 2015 1969 1968 normal 1963,2019 11 51.3 52.2 -0.9 51 45 1949 2015 1969 1968 normal 1975,1994,1996 12 51.0 52.0 -1.0 43 53 1949 2015 1969 1968 normal 1964,1996,2023 18 46.1 48.2 -2.1 22 73 1950 2016 1960 1969 bottom-third 1943,1987 24 50.3 52.0 -1.7 26 69 1950 2016 1966 1969 bottom-third 1948,1966,1972 36 51.2 52.0 -0.8 57 37 1957 2017,2022 1967 1969 normal 1983,1994,2011,2012,2013 48 51.5 52.0 -0.5 63 30 1952 2018 1968 1969 top-third 1968,1994,2003,2009,2013 60 51.5 52.0 -0.5 63 29 1933,1952 2018,2019,2022 1969 1942 top-third 1941,1996,2011,2014