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. There is also a count of the number of days with wet weather, when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The rainfall totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

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 4.2 106
10 Chicago Botanical Garden 3.7 95
10 Chicago Midway Airport 4.0 102
10 Chicago O'Hare Airport 3.7 94
9 Elgin 4.0 101
9 Joliet 4.6 116
9 Rochelle 3.6 90

Northern Illinois

July averages for total rainfall
Days Place Inches Milli­metres
10 DeKalb 4.0 102
8 Dixon 4.3 109
10 Freeport 4.2 107
9 Moline 4.2 107
9 Rockford 3.8 97
10 Waukegan 3.5 88

Central Illinois

Average amount of rain in July
Days Place Inches Milli­metres
7 Alton 4.0 100
8 Bloomington 3.8 98
8 Cahokia 5.0 128
10 Champaign 4.5 114
9 Charleston 4.4 112
10 Danville 4.3 110
10 Decatur 4.0 102
9 Kankakee 4.7 118
8 Ottawa 3.6 92
9 Peoria 3.5 90
9 Quincy 3.5 89
9 Springfield 3.9 98

Southern Illinois

Precipitation totals for July
Days Place Inches Milli­metres
7 Belleville 4.0 102
9 Carbondale 4.1 105
9 Mt Vernon 3.8 96
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Illinois Precipitation
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