| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 43w - Powder River Basin | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 82633 - Douglas, WY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 15 | 22 | 29 | 39 | 48 | 54 | 52 | 41 | 30 | 20 | 12 | 31 |
| Avg Max Temp (°F) | 37 | 41 | 49 | 57 | 67 | 79 | 86 | 85 | 75 | 62 | 46 | 39 | 60 |
| Avg Precip (In.) | .38 | .42 | .79 | 1.67 | 2.56 | 1.45 | 1.57 | .94 | 1.08 | .83 | .73 | .37 | 12.8 |