| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 47g - Lower St. Croix and Vermillion Valleys |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54022 - River Falls, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 2 | 8 | 20 | 33 | 45 | 55 | 59 | 57 | 48 | 37 | 23 | 9 | 33 |
| Avg Max Temp (°F) | 22 | 29 | 41 | 57 | 70 | 79 | 83 | 80 | 71 | 59 | 40 | 26 | 55 |
| Avg Precip (In.) | .85 | .67 | 1.57 | 2.58 | 3.54 | 4.42 | 4.33 | 4.51 | 3.34 | 2.38 | 1.74 | .85 | 30.8 |