While much attention has been given to the areas of heavy rain in Illinois, there were two areas of significant dryness in the state in July. A product from the NWS that combines radar estimates and rain gauge measurements better defined those areas. See figure below.
One area of dryness in July was across north-central Illinois. Amounts in this area were only 25-75 percent of normal. Fortunately, this area received ample rain in June. Even so, the drying of the topsoil is clear in the August 2 USDA NASS Illinois Weather and Crops report.
The other area of dryness in July was in southern Illinois, south of I-64. This area was dry in June as well. As a result of two consecutive months of dry weather, the U.S. Drought Monitor designated this area as “abnormally dry.”
Here is the link to the NWS product: http://water.weather.gov/precip/