Heatwaves In The Midwest Used To Be Much Worse | Real Science

http://stevengoddard.wordpress.com/2012/07/01/heatwaves-in-the-us-used-to-be-much-worse/

Des Moines has had only one 100 degree day during the last nine years, but in 1934 they had 31 days over 100 degrees, including three days in May.