Rock Falls, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.1 °C (low) to 15.1 °C (high). Annual precipitation averages 999.5 Millimeters. Rock Falls is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.5 °C | -1.4 °C | 43.43 mm |
| February | -8.4 °C | 1.1 °C | 43.69 mm |
| March | -2.6 °C | 8.1 °C | 60.71 mm |
| April | 3.3 °C | 15.7 °C | 97.28 mm |
| May | 10 °C | 22 °C | 124.97 mm |
| June | 15.4 °C | 27.1 °C | 137.67 mm |
| July | 17.2 °C | 28.7 °C | 108.71 mm |
| August | 16.1 °C | 27.7 °C | 108.71 mm |
| September | 11.4 °C | 24.4 °C | 95.5 mm |
| October | 4.9 °C | 17.3 °C | 71.37 mm |
| November | -1.3 °C | 8.7 °C | 58.17 mm |
| December | -6.8 °C | 1.7 °C | 49.28 mm |
| Annual | 4.1 °C | 15.1 °C | 999.49 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |