Weather Avenue > 
Weather America > 
United States > 
Illinois > 
| Month | Max. | Min. | Avg. |
|---|---|---|---|
| January | 13°C | -15°C | 1°C |
| February | 24°C | -4°C | 9°C |
| March | 25°C | -2°C | 12°C |
| April | 28°C | 1°C | 15°C |
| May | 30°C | 11°C | 21°C |
| June | 36°C | 13°C | 24°C |
| July | 35°C | 14°C | 25°C |
| August | 40°C | 11°C | 26°C |
| September | 36°C | 8°C | 23°C |
| October | 33°C | -1°C | 17°C |
| November | 27°C | -4°C | 10°C |
| December | 18°C | -4°C | 7°C |
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