It's been hot.  Ready for a big cool down this weekend.   

Statement as of 01:30 am CDT on September 11, 2013
... Record maximum low temperature set at Evansville in... 
For Tuesday September 10th the low temperature recorded at 
Evansville Indiana was 76 degrees... this set a new maximum low 
temperature record for that date. The old record was 74 degrees set
113 years ago... in 1900.