US Geography / US Weather / Illinois Weather / Mt Vernon |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 37° | 42° | 54° | 65° | 75° | 84° | 88° | 86° | 78° | 68° | 54° | 42° |
| Avg. Low | 17° | 21° | 32° | 44° | 52° | 61° | 65° | 64° | 56° | 44° | 34° | 24° |
| Mean | 28° | 32° | 44° | 55° | 64° | 74° | 77° | 75° | 68° | 56° | 45° | 34° |
| Avg. Precip. | 2.3 in | 2.6 in | 4.3 in | 4.3 in | 4.4 in | 3.4 in | 4.0 in | 3.3 in | 3.3 in | 2.9 in | 4.0 in | 3.6 in |
Degrees in Fahrenheit
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