The very hot weather which occurred over the last 2 weeks further dried out the ground across much of central and southeast Illinois , even in those areas that managed to receive rainfall.
According to the U.S. Drought Monitor  from July 10, extreme drought conditions were occurring in far southeast Illinois. Most of the remainder of central and southeast Illinois were considered to be in a severe drought. Moderate drought conditions exist northwest of the Illinois River Valley (west of a Lacon to Havana line).
July 13-15 Rainfall Amounts 
Drought Fact Sheet