Weather Avenue > 
Weather America > 
United States > 
Illinois > 
| Month | Max. | Min. | Avg. |
|---|---|---|---|
| January | 8°C | -21°C | -3°C |
| February | 23°C | -13°C | 5°C |
| March | 24°C | -3°C | 9°C |
| April | 26°C | 0°C | 13°C |
| May | 29°C | 10°C | 19°C |
| June | 33°C | 9°C | 23°C |
| July | 31°C | 10°C | 22°C |
| August | 35°C | 9°C | 22°C |
| September | 36°C | 6°C | 21°C |
| October | 32°C | -3°C | 15°C |
| November | 20°C | -9°C | 7°C |
| December | 14°C | -6°C | 4°C |
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