US Geography / US Weather / Illinois Weather / Jerseyville |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 35° | 40° | 52° | 64° | 74° | 84° | 87° | 85° | 78° | 67° | 54° | 38° |
| Avg. Low | 15° | 18° | 31° | 42° | 51° | 60° | 64° | 61° | 54° | 44° | 34° | 21° |
| Mean | 26° | 30° | 42° | 54° | 64° | 72° | 76° | 74° | 67° | 55° | 44° | 31° |
| Avg. Precip. | 1.6 in | 1.8 in | 3.4 in | 3.8 in | 3.9 in | 3.6 in | 3.8 in | 3.6 in | 3.6 in | 2.8 in | 3.3 in | 2.8 in |
Degrees in Fahrenheit
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