US Geography / US Weather / Illinois Weather / Jacksonville |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 34 | 37 | 50 | 64 | 74 | 82 | 86 | 84 | 78 | 66 | 52 | 37 |
| Avg. Low | 14 | 18 | 28 | 41 | 50 | 58 | 64 | 61 | 54 | 42 | 31 | 20 |
| Mean | 24 | 28 | 40 | 52 | 62 | 71 | 75 | 74 | 66 | 55 | 42 | 28 |
| Avg. Precip. | 1.3 in | 1.6 in | 3.3 in | 3.9 in | 4.9 in | 4.3 in | 4.3 in | 3.5 in | 4.0 in | 3.0 in | 2.8 in | 2.6 in |
Degrees in Fahrenheit
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