US Geography / US Weather / Illinois Weather / Altamont |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 34° | 38° | 51° | 64° | 74° | 84° | 87° | 85° | 78° | 67° | 54° | 38° |
| Avg. Low | 16° | 18° | 31° | 42° | 51° | 61° | 65° | 62° | 55° | 44° | 34° | 22° |
| Mean | 26° | 30° | 42° | 54° | 64° | 74° | 76° | 74° | 67° | 55° | 44° | 31° |
| Avg. Precip. | 2.1 in | 2.3 in | 3.8 in | 3.7 in | 4.1 in | 4.3 in | 4.1 in | 2.8 in | 3.1 in | 2.8 in | 3.5 in | 3.6 in |
Degrees in Fahrenheit
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