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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