Here are normal monthly and seasonal temperatures and precipitation as well as selected records for the state of Illinois.

Springfield Climate -- Temperature and Precipitation Normals by Month ; June, 84.0, 63.3 ; July, 86.8, 66.2 ; August, 85.4, 64.3 ; September, 80.2, 55.8 ...

Normal Climate Graph - Illinois Climate Chart ; Jan, 2.13, 15 ; Feb, 1.93, 18 ; Mar, 2.71, 27 ; Apr, 3.67, 38 ...

You can drill down to a specific season, month, and even day by clicking the graphs or using the navigation panel. ... Average Monthly Rainfall in Illinois.

Here are extensive climate statistics for individual sites in Illinois, including monthly normals and extremes.

The tables below give monthly averages for rainfall plus snowfall during March at cities in Illinois. Each place has a total for the amount of precipitation ...

Average Rainfall for Chicago ... The driest month in Chicago is February with 1.63 inches of precipitation, and with 4.62 inches August is the wettest month.

On average, June is the wettest month with 126 mm of precipitation. On average, January is the driest month with 50 mm ...

1991-2020 Monthly and Yearly Normals for Chicago and Rockford. Chicago, IL Rockford, IL. Click here for the old 1981 to 2010 Normals for Chicago and Rockford.