US Geography / US Weather / Illinois Weather / Muddy |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 41 | 46 | 57 | 68 | 78 | 87 | 90 | 88 | 82 | 71 | 57 | 45 |
| Avg. Low | 22 | 26 | 36 | 46 | 54 | 64 | 67 | 64 | 57 | 45 | 37 | 27 |
| Mean | 32 | 36 | 47 | 58 | 67 | 75 | 78 | 77 | 70 | 58 | 48 | 37 |
| Avg. Precip. | 2.8 in | 3.3 in | 4.9 in | 4.3 in | 5.1 in | 3.9 in | 4.0 in | 3.3 in | 3.0 in | 2.9 in | 4.0 in | 4.1 in |
Degrees in Fahrenheit
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