| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| 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 54015 - Hammond, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 2 | 8 | 20 | 33 | 46 | 55 | 60 | 57 | 48 | 37 | 23 | 9 | 33 |
| Avg Max Temp (°F) | 21 | 28 | 40 | 56 | 69 | 78 | 82 | 79 | 70 | 58 | 39 | 25 | 54 |
| Avg Precip (In.) | 1.02 | .79 | 1.81 | 2.7 | 3.46 | 4.53 | 4.3 | 4.56 | 3.63 | 2.32 | 1.99 | .95 | 32.06 |