US Geography / US Weather / Illinois Weather / Harrisburg |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 38 | 42 | 54 | 66 | 76 | 85 | 88 | 87 | 80 | 68 | 55 | 42 |
| Avg. Low | 18 | 22 | 34 | 44 | 54 | 62 | 65 | 64 | 56 | 44 | 35 | 24 |
| Mean | 28 | 34 | 44 | 55 | 65 | 74 | 77 | 75 | 68 | 57 | 45 | 34 |
| Avg. Precip. | 2.5 in | 2.7 in | 4.6 in | 4.3 in | 4.6 in | 3.4 in | 3.8 in | 3.1 in | 2.8 in | 3.0 in | 4.1 in | 3.8 in |
Degrees in Fahrenheit
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