Illinois, Climate Division 7. East Southeast, Average Temperature Rankings, April 2012 1901-2000 Degrees Fahrenheit 1 55.8 52.8 3.0 107 23 1907 2010 2009 2011 top-third 1906,1946 2 56.4 47.2 9.2 129 1 1926 2012 2011 2012 highest 3 50.1 42.0 8.1 129 1 1978 2012 2011 2012 highest 4 46.0 38.4 7.6 129 1 1978 2012 2011 2012 highest 5 44.4 37.1 7.3 128 1 1978 2012 2011 2012 highest 6 45.0 37.9 7.1 128 1 1978 2012 2011 2012 highest 7 46.5 40.5 6.0 128 1 1978 2012 2011 2012 highest 8 48.9 43.8 5.1 127 2 1904,1918,1978 2017 2011 2012 top-tenth 9 51.8 47.2 4.6 127 2 1918 2017 2011 2012 top-tenth 10 54.7 50.1 4.6 128 1 1918 2012 2011 2012 highest 11 56.5 52.2 4.3 128 1 1904,1918 2012 2011 2012 highest 12 57.0 53.1 3.9 128 1 1918 2012 2011 2012 highest 18 50.7 48.0 2.7 124 4 1905,1979 2017 2011 2006 top-tenth 1999,2006 24 55.7 53.1 2.6 126 2 1978 2017 2011 2012 top-tenth 2013 36 54.8 53.0 1.8 121 6 1979 2018 2011 2008 top-tenth 2008,2017 48 54.4 53.0 1.4 115 11 1980 2019 2011 2008 top-tenth 1955,1992,2000,2001,2007,2018,2022 60 54.5 53.0 1.5 120 5 1981 2020 2011 2008 top-tenth 1957,2002,2003,2006,2008