Illinois Annual Rainfall see below for individual cities 


 

Illinois city precipitation totals

City

Avg Annual Precip

Avg Snow Annual

 Avg. days of Precip
Chicago 36.27 38.0 126
Moline 38.04 30.5 114
Peoria 36.03 25.0 114
Rockford 36.63 34.5 118
Springfield 35.56 23.1 114
State Average - 39.32 inches, 37th wettest in U.S. 

Illinois Precipitation Records 

  • Driest location ranked by lowest annual average precipitation: Waukegan, northern Illinois, 32.32"
  • Wettest location ranked by highest annual average precipitation: Rosiclare, southern Illinois, 104.18" 
  • Snowiest location ranked by highest annual average snowfall: Chicago Midway Airport, northern Illinois, 42.8"
  • State precipitation record for 24 hours - Aurora, northeastern Illinois, 7/17-18/1996, 16.94"
  • State precipitation record for 1 year - New Burnside, southern Illinois, 1950, 74.58"
  • State snowfall record for 24 hours - Astoria, western Illinois, 7/17-18/1996, 16.94"
  • State snow record for 1 season - Antioch, northeastern Illinois, 1978-1979, 103.3"
  • On 01/31/1982, a major snowstorm struck Illinois. Twenty-five inches of snow was recorded at Greenville Illinois, 
located east of Saint Louis. The storm left 4000 motorists stranded for two days

Precipitation data for other U.S. states
Data source: National Data Climatic Center