US Geography / US Weather / Illinois Weather / Thomson |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 28° | 32° | 44° | 58° | 71° | 80° | 84° | 81° | 74° | 64° | 47° | 32° |
| Avg. Low | 8° | 14° | 26° | 38° | 50° | 60° | 64° | 62° | 54° | 42° | 30° | 16° |
| Mean | 18° | 24° | 36° | 48° | 61° | 70° | 75° | 72° | 64° | 54° | 38° | 25° |
| Avg. Precip. | 1.3 in | 0.9 in | 2.3 in | 3.3 in | 3.8 in | 4.3 in | 3.7 in | 4.7 in | 3.5 in | 2.7 in | 2.3 in | 1.8 in |
Degrees in Fahrenheit
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