| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50e - Chequamegon Moraines and Outwash Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54801 - Spooner, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -1 | 6 | 19 | 31 | 43 | 52 | 57 | 55 | 47 | 36 | 22 | 7 | 31 |
| Avg Max Temp (°F) | 21 | 29 | 40 | 56 | 70 | 78 | 81 | 79 | 70 | 58 | 39 | 25 | 54 |
| Avg Precip (In.) | .87 | .69 | 1.46 | 2.21 | 3.13 | 4.01 | 4.23 | 4.59 | 3.7 | 2.58 | 1.9 | .85 | 30.22 |