| 2023 Hardiness Zone: | 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: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | Jun. 1 - Jun. 10 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 50i - Northern Highlands Lakes Country | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54547 - Mercer, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -3 | 2 | 14 | 27 | 40 | 50 | 55 | 53 | 44 | 33 | 21 | 5 | 28 |
| Avg Max Temp (°F) | 19 | 25 | 36 | 51 | 66 | 73 | 76 | 74 | 64 | 53 | 36 | 23 | 50 |
| Avg Precip (In.) | 1.42 | .93 | 1.84 | 2.28 | 3.38 | 4.05 | 4.2 | 4.44 | 3.88 | 2.98 | 2.39 | 1.48 | 33.27 |