| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°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: | 52b - Paleozoic Plateau/Coulee Section |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54656 - Sparta, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 3 | 10 | 22 | 34 | 45 | 54 | 59 | 57 | 48 | 37 | 25 | 10 | 34 |
| Avg Max Temp (°F) | 23 | 30 | 42 | 57 | 70 | 79 | 83 | 80 | 71 | 59 | 42 | 28 | 55 |
| Avg Precip (In.) | .86 | .84 | 1.84 | 3.23 | 3.97 | 4.16 | 4.37 | 4.48 | 3.86 | 2.28 | 2.25 | 1.16 | 33.31 |