US Geography / US Weather / Illinois Weather / Normal |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 32 | 37 | 50 | 64 | 74 | 84 | 86 | 84 | 78 | 67 | 51 | 37 |
| Avg. Low | 15 | 18 | 30 | 41 | 51 | 61 | 65 | 64 | 56 | 44 | 34 | 21 |
| Mean | 24 | 28 | 40 | 54 | 64 | 74 | 76 | 74 | 67 | 56 | 44 | 28 |
| Avg. Precip. | 1.6 in | 1.5 in | 3.1 in | 3.8 in | 4.3 in | 3.8 in | 4.0 in | 3.4 in | 3.9 in | 2.6 in | 2.7 in | 2.6 in |
Degrees in Fahrenheit
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