| 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 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | Jun. 1 - Jun. 10 | |
| Koppen-Geiger Climate Zone: | BWk - Cold Desert Climate | |
| Ecoregion: | 18d - Foothill Shrublands and Low Mountains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 82443 - Thermopolis, WY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 13 | 22 | 30 | 39 | 47 | 53 | 51 | 41 | 31 | 18 | 8 | 30 |
| Avg Max Temp (°F) | 35 | 42 | 52 | 61 | 70 | 81 | 88 | 87 | 77 | 64 | 46 | 36 | 62 |
| Avg Precip (In.) | .48 | .4 | .94 | 1.61 | 2.62 | 1.36 | .7 | .72 | 1.08 | 1.3 | .61 | .51 | 12.33 |