How cold does it get during the winter months?
Question & Answer about Illinois
Updated April 26, 2026
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Illinois State Facts
State Flag
Illinois
Capital
Springfield
State Bird
Northern Cardinal
Statehood
December 3, 1818
State Flower
Violet
Population
12.5 million (2020)
Answer
Winter in Illinois typically brings cold temperatures, with averages ranging from the low teens to mid-30s Fahrenheit (-10 to 2 degrees Celsius). Northern parts of the state, including cities like Chicago, experience colder conditions, often seeing temperatures drop below zero Fahrenheit (-18 Celsius) during cold snaps. Southern Illinois tends to be milder but can still have freezing temperatures.
The state’s winter climate is influenced by its location in the Midwest, where Arctic air masses from Canada frequently bring frigid weather. Snowfall is common, especially in northern and central Illinois, with Chicago averaging around 36 inches annually. Wind chill factors often make it feel colder than the actual air temperature, particularly near Lake Michigan in Chicago, where lake-effect snow and winds add to the winter severity.
Key Points:
- Winter temperatures can range from low teens to below zero in northern Illinois
- Southern Illinois is generally milder but still experiences freezing conditions
- Snowfall is common, with Chicago averaging about 36 inches annually
- Wind chill and lake-effect snow intensify winter weather in northern areas
The state’s winter climate is influenced by its location in the Midwest, where Arctic air masses from Canada frequently bring frigid weather. Snowfall is common, especially in northern and central Illinois, with Chicago averaging around 36 inches annually. Wind chill factors often make it feel colder than the actual air temperature, particularly near Lake Michigan in Chicago, where lake-effect snow and winds add to the winter severity.
Key Points:
- Winter temperatures can range from low teens to below zero in northern Illinois
- Southern Illinois is generally milder but still experiences freezing conditions
- Snowfall is common, with Chicago averaging about 36 inches annually
- Wind chill and lake-effect snow intensify winter weather in northern areas
