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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