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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