US Geography / US Weather / Illinois Weather / Okawville |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 37 | 42 | 55 | 66 | 76 | 85 | 88 | 86 | 80 | 68 | 55 | 42 |
| Avg. Low | 20 | 24 | 35 | 45 | 54 | 64 | 67 | 64 | 57 | 46 | 36 | 25 |
| Mean | 28 | 34 | 45 | 56 | 65 | 74 | 78 | 76 | 68 | 58 | 46 | 34 |
| Avg. Precip. | 1.9 in | 2.5 in | 3.9 in | 3.7 in | 4.0 in | 3.4 in | 3.7 in | 3.0 in | 3.1 in | 3.0 in | 3.5 in | 3.4 in |
Degrees in Fahrenheit
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