| 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 4b: -25F to -20F | |
| 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 | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54667 - Westby, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 12 | 23 | 34 | 46 | 55 | 60 | 58 | 49 | 38 | 25 | 12 | 35 |
| Avg Max Temp (°F) | 23 | 29 | 41 | 56 | 69 | 77 | 81 | 79 | 70 | 58 | 41 | 27 | 54 |
| Avg Precip (In.) | .96 | .84 | 1.74 | 3.42 | 3.6 | 4.01 | 4.59 | 4.58 | 3.63 | 2.22 | 2.02 | 1.17 | 32.78 |