Weather Avenue > 
Weather America > 
United States > 
Illinois > 
| Month | Max. | Min. | Avg. |
|---|---|---|---|
| January | 10°C | -32°C | -6°C |
| February | 20°C | -9°C | 5°C |
| March | 22°C | -4°C | 7°C |
| April | 27°C | 0°C | 11°C |
| May | 28°C | 7°C | 17°C |
| June | 33°C | 11°C | 22°C |
| July | 33°C | 11°C | 22°C |
| August | 37°C | 6°C | 22°C |
| September | 38°C | 5°C | 20°C |
| October | 33°C | -4°C | 14°C |
| November | 20°C | -11°C | 5°C |
| December | 15°C | -6°C | 3°C |
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