| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | BWk - Cold Desert Climate |
| Ecoregion: | 18g - Bighorn Salt Desert Shrub Basin |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 82435 - Powell, WY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 14 | 22 | 31 | 41 | 49 | 54 | 52 | 42 | 31 | 19 | 10 | 31 |
| Avg Max Temp (°F) | 30 | 39 | 49 | 59 | 69 | 79 | 86 | 85 | 73 | 60 | 43 | 34 | 59 |
| Avg Precip (In.) | .22 | .12 | .33 | .52 | 1.41 | 1.25 | .96 | .52 | .7 | .55 | .18 | .17 | 6.92 |