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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