Weather trivia for central Illinois from 
http://www.weather.gov/ilx/
http://www.weather.gov/media/ilx/Trivia/wxTrivia_january.pdf
http://www.weather.gov/media/ilx/Trivia/wxTrivia_february.pdf
http://www.weather.gov/media/ilx/Trivia/wxTrivia_march.pdf
http://www.weather.gov/media/ilx/Trivia/wxTrivia_april.pdf
http://www.weather.gov/media/ilx/Trivia/wxTrivia_may.pdf
http://www.weather.gov/media/ilx/Trivia/wxTrivia_june.pdf
http://www.weather.gov/media/ilx/Trivia/wxTrivia_july.pdf
http://www.weather.gov/media/ilx/Trivia/wxTrivia_august.pdf
http://www.weather.gov/media/ilx/Trivia/wxTrivia_september.pdf
http://www.weather.gov/media/ilx/Trivia/wxTrivia_october.pdf
see also history of Wx obs in central Illinois  http://www.weather.gov/ilx/nwshistory