| 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 Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Sep.11 - Sep. 20 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 43q - Mesic Dissected Plains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 82839 - Ranchester, WY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 14 | 21 | 30 | 38 | 46 | 51 | 49 | 40 | 30 | 18 | 10 | 30 |
| Avg Max Temp (°F) | 34 | 40 | 49 | 58 | 67 | 77 | 85 | 86 | 74 | 61 | 44 | 36 | 59 |
| Avg Precip (In.) | .69 | .55 | .98 | 1.81 | 2.56 | 2.28 | 1.27 | .81 | 1.43 | 1.42 | .82 | .67 | 15.28 |