Average Rainfall for Illinois in July





The tables below give monthly averages for rainfall during July at cities in Illinois.

Each place has a total for the amount of precipitation it usually receives this month. Most sites also have information on the number of days with wet weather. This includes the days when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The rainfall totals are averages based on weather data collected from 1981 to 2010 for the NOAA National Climatic Data Center.

You can jump to a separate table for each region of the state: Chicago Area, Northern Illinois, Central Illinois and Southern Illinois.

Chicago Area

Average monthly precipitation in July
Days Place Inches Milli­metres
9 Aurora 3.9 99
10 Chicago Botanical Garden 3.6 92
10 Chicago Midway Airport 4.0 102
10 Chicago O'Hare Airport 3.7 94
10 Chicago University 3.8 96
9 Elgin 3.8 97
9 Joliet 4.3 110

Northern Illinois

July averages for total rainfall
Days Place Inches Milli­metres
9 Antioch 3.6 91
10 DeKalb 4.4 111
8 Dixon 4.1 105
10 Freeport 3.9 100
10 Moline 4.3 109
9 Rockford 4.0 100
Waukegan 3.9 99

Central Illinois

Average amount of rain in July
Days Place Inches Milli­metres
8 Alton 3.6 92
9 Cahokia 4.4 113
10 Danville 4.7 119
9 Peoria 3.9 98
9 Quincy 4.0 103
9 Springfield 3.9 100
10 Urbana 4.7 119

Southern Illinois

Precipitation totals for July
Days Place Inches Milli­metres
8 Cairo 4.1 105
8 Marion 4.3 108
9 Mt Vernon 3.7 93
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

Illinois Precipitation
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