| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F |
| 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: | 51a - St. Croix Outwash Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54024 - Saint Croix Falls, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 0 | 7 | 20 | 33 | 46 | 54 | 60 | 58 | 49 | 37 | 23 | 8 | 33 |
| Avg Max Temp (°F) | 22 | 29 | 41 | 57 | 71 | 79 | 83 | 80 | 71 | 59 | 40 | 26 | 55 |
| Avg Precip (In.) | .88 | .67 | 1.59 | 2.55 | 3.36 | 4.49 | 4.06 | 4.66 | 3.58 | 2.47 | 1.74 | .81 | 30.84 |