| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | 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 54761 - Plum City, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 3 | 9 | 21 | 34 | 46 | 55 | 60 | 58 | 49 | 37 | 24 | 10 | 34 |
| Avg Max Temp (°F) | 22 | 29 | 41 | 57 | 70 | 79 | 83 | 80 | 71 | 59 | 40 | 26 | 55 |
| Avg Precip (In.) | 1.08 | .74 | 1.87 | 3.01 | 3.51 | 4.31 | 4.52 | 4.37 | 3.58 | 2.35 | 2.11 | 1.03 | 32.49 |