| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°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 5a: -20F to -15F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 25c - Moderate Relief Plains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 82009 - Cheyenne, WY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 17 | 22 | 29 | 38 | 48 | 53 | 52 | 43 | 33 | 22 | 16 | 32 |
| Avg Max Temp (°F) | 37 | 41 | 47 | 55 | 65 | 76 | 82 | 81 | 71 | 60 | 45 | 39 | 58 |
| Avg Precip (In.) | .43 | .43 | 1.06 | 1.56 | 2.51 | 2.14 | 2.16 | 1.8 | 1.43 | .8 | .63 | .46 | 15.41 |