River Falls, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.7 °C (low) to 12.4 °C (high). Annual precipitation averages 850.1 Millimeters. River Falls is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.6 °C | -5.1 °C | 23.11 mm |
| February | -12.8 °C | -2.3 °C | 20.83 mm |
| March | -6 °C | 4.6 °C | 38.61 mm |
| April | 1.2 °C | 12.9 °C | 73.15 mm |
| May | 8.2 °C | 19.8 °C | 105.16 mm |
| June | 13.9 °C | 25.2 °C | 130.3 mm |
| July | 16.3 °C | 27.6 °C | 113.28 mm |
| August | 15 °C | 26.3 °C | 118.62 mm |
| September | 10.5 °C | 22.1 °C | 90.17 mm |
| October | 3.3 °C | 14.3 °C | 68.58 mm |
| November | -3.7 °C | 5.4 °C | 39.62 mm |
| December | -10.5 °C | -2.2 °C | 28.7 mm |
| Annual | 1.7 °C | 12.4 °C | 850.13 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |