Average Precipitation for Illinois in October





The tables below give monthly averages for rainfall plus snowfall during October 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 precipitation 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 October
Days Place Inches Milli­metres
9 Aurora 3.1 78
11 Chicago Botanical Garden 3.2 82
10 Chicago Midway Airport 3.2 82
10 Chicago O'Hare Airport 3.2 80
11 Chicago University 2.9 73
10 Elgin 2.9 74
10 Joliet 2.8 72

Northern Illinois

October averages for total rainfall plus snowfall
Days Place Inches Milli­metres
10 Antioch 3.1 78
10 DeKalb 2.9 73
7 Dixon 2.9 74
9 Freeport 2.9 73
9 Moline 3.0 75
9 Rockford 2.7 68
Waukegan 2.9 74

Central Illinois

Average amount of rain and snow in October
Days Place Inches Milli­metres
8 Alton 3.3 84
8 Cahokia 3.4 87
9 Danville 3.6 91
9 Peoria 2.8 72
9 Quincy 3.0 76
9 Springfield 3.2 80
10 Urbana 3.3 83

Southern Illinois

Precipitation totals for October
Days Place Inches Milli­metres
8 Cairo 4.1 103
8 Marion 3.7 94
9 Mt Vernon 3.7 93
Reference

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

Illinois Precipitation
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