River Falls, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.9 °C (low) to 25.6 °C (high). Annual precipitation averages 1562.9 Millimeters. River Falls is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.1 °C | 15.9 °C | 143.76 mm |
| February | 4 °C | 18.4 °C | 121.41 mm |
| March | 7.3 °C | 22.2 °C | 142.49 mm |
| April | 10.9 °C | 25.8 °C | 121.67 mm |
| May | 15.7 °C | 29.7 °C | 113.79 mm |
| June | 19.9 °C | 32.5 °C | 146.81 mm |
| July | 21.3 °C | 33.4 °C | 168.4 mm |
| August | 21.1 °C | 33 °C | 138.94 mm |
| September | 18.4 °C | 31.3 °C | 122.43 mm |
| October | 12.2 °C | 26.7 °C | 91.44 mm |
| November | 6.2 °C | 21.2 °C | 110.49 mm |
| December | 3.8 °C | 17.3 °C | 141.22 mm |
| Annual | 11.9 °C | 25.6 °C | 1562.85 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |