Average Precipitation for Illinois in January





The tables below give monthly averages for rainfall plus snowfall during January 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 January
Days Place Inches Milli­metres
9 Aurora 1.7 43
10 Chicago Botanical Garden 1.8 46
11 Chicago Midway Airport 2.1 52
11 Chicago O'Hare Airport 1.7 44
9 Chicago University 2.3 57
8 Elgin 1.9 47
11 Joliet 1.8 46

Northern Illinois

January averages for total rainfall plus snowfall
Days Place Inches Milli­metres
9 Antioch 1.6 41
10 DeKalb 1.5 38
7 Dixon 1.6 40
8 Freeport 1.4 35
9 Moline 1.5 38
9 Rockford 1.4 35
Waukegan 1.4 35

Central Illinois

Average amount of rain and snow in January
Days Place Inches Milli­metres
7 Alton 2.4 61
8 Cahokia 2.6 67
10 Danville 2.2 56
9 Peoria 1.8 45
8 Quincy 1.5 39
9 Springfield 1.8 46
9 Urbana 2.1 52

Southern Illinois

Precipitation totals for January
Days Place Inches Milli­metres
8 Cairo 3.7 94
9 Marion 3.3 83
8 Mt Vernon 2.3 59
Reference

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

Illinois Precipitation
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