Average Annual Precipitation for Illinois

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The tables below give yearly averages for rainfall plus snowfall at cities in Illinois.

Each place has a total for the amount of precipitation it usually receives in a year. Most locations 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 annual 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 yearly precipitation
Days Place Inches Millimetres
116 Aurora 37.7   957
123 Chicago Botanical Garden 37.8   959
123 Chicago Midway Airport 39.1   993
124 Chicago O'Hare Airport 36.9   937
126 Chicago University 38.0   964
114 Elgin 37.8   959
121 Joliet 36.8   935

Northern Illinois

Annual averages for rainfall plus snowfall
Days Place Inches Millimetres
114 Antioch 36.7   932
120 DeKalb 37.0   939
  97 Dixon 38.4   975
113 Freeport 36.1   916
117 Moline 38.0   964
119 Rockford 36.2   920
  – Waukegan 35.6   904

Central Illinois

Average amount of rain and snow a year
Days Place Inches Millimetres
  99 Alton 41.3 1049
108 Cahokia 42.7 1085
122 Danville 42.0 1067
117 Peoria 36.5   927
111 Quincy 37.3   948
113 Springfield 37.4   951
121 Urbana 41.4 1051

Southern Illinois

Average annual precipitation
Days Place Inches Millimetres
106 Cairo 48.6 1235
108 Marion 48.5 1233
115 Mt Vernon 43.4 1102
Reference

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

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