US Geography / US Weather / Illinois Weather / Rock Island |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 28 | 34 | 46 | 61 | 72 | 82 | 85 | 84 | 75 | 64 | 48 | 34 |
| Avg. Low | 11 | 15 | 28 | 38 | 48 | 58 | 64 | 61 | 54 | 41 | 30 | 17 |
| Mean | 20 | 25 | 37 | 50 | 61 | 71 | 75 | 74 | 65 | 54 | 40 | 25 |
| Avg. Precip. | 1.5 in | 1.3 in | 3.0 in | 3.9 in | 4.3 in | 4.3 in | 5.0 in | 4.3 in | 4.0 in | 2.9 in | 2.5 in | 2.3 in |
Degrees in Fahrenheit
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