US Geography / US Weather / Illinois Weather / Bourbonnais |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 28 | 34 | 47 | 60 | 71 | 82 | 84 | 82 | 76 | 64 | 48 | 35 |
| Avg. Low | 12 | 15 | 28 | 38 | 48 | 58 | 62 | 58 | 52 | 40 | 30 | 18 |
| Mean | 21 | 25 | 38 | 48 | 60 | 70 | 74 | 71 | 65 | 52 | 40 | 27 |
| Avg. Precip. | 1.6 in | 1.7 in | 3.4 in | 4.1 in | 4.1 in | 4.1 in | 4.3 in | 3.5 in | 3.7 in | 2.9 in | 3.3 in | 2.9 in |
Degrees in Fahrenheit
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