Average Snowfall for Illinois in December

The tables below give monthly averages for snowfall during December at cities in Illinois. The numbers are for the total amount of new snow and how many days it snows at least 0.1 inches (0.25 centimetres) this month.

The snowfall totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

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 total snowfall in December

Days	Place	Inches	Centi­metres
4.0	Aurora	6.4	16.3
5.4	Chicago Botanical Garden	5.9	15.0
6.3	Chicago Midway Airport	7.9	20.1
6.1	Chicago O'Hare Airport	7.6	19.3
5.2	Elgin	8.7	22.1
2.7	Joliet	3.2	8.1

Northern Illinois

December snowfall averages

Days	Place	Inches	Centi­metres
6.0	DeKalb	6.6	16.8
4.1	Dixon	5.6	14.2
5.0	Freeport	8.9	22.6
5.9	Moline	8.8	22.4
6.8	Rockford	9.4	23.9

Central Illinois

Average snow for December

Days	Place	Inches	Centi­metres
1.0	Bloomington	2.6	6.6
4.1	Champaign	4.8	12.2
3.2	Charleston	3.0	7.6
2.3	Danville	3.0	7.6
2.3	Decatur	3.5	8.9
3.5	Kankakee	5.3	13.5
3.4	Ottawa	4.8	12.2
4.6	Peoria	6.2	15.7
3.6	Springfield	4.3	10.9

Southern Illinois

Average total snowfall in December

Days	Place	Inches	Centi­metres
1.9	Belleville	2.9	7.4
1.7	Carbondale	2.7	6.9
1.0	Mt Vernon	2.5	6.4