Weather Avenue > 
Weather America > 
United States > 
Illinois > 
| Month | Max. | Min. | Avg. |
|---|---|---|---|
| January | 10°C | -28°C | -4°C |
| February | 22°C | -14°C | 6°C |
| March | 24°C | -4°C | 9°C |
| April | 27°C | 0°C | 13°C |
| May | 29°C | 8°C | 19°C |
| June | 33°C | 11°C | 22°C |
| July | 35°C | 0°C | 22°C |
| August | 40°C | 9°C | 24°C |
| September | 36°C | 7°C | 22°C |
| October | 33°C | -4°C | 15°C |
| November | 23°C | -10°C | 7°C |
| December | 17°C | -6°C | 5°C |
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