| 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 |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| 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: | 18c - Wet Valleys |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 82510 - Arapahoe, WY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 3 | 9 | 20 | 29 | 38 | 47 | 52 | 50 | 40 | 29 | 15 | 4 | 28 |
| Avg Max Temp (°F) | 30 | 38 | 49 | 58 | 68 | 80 | 88 | 86 | 74 | 61 | 42 | 32 | 59 |
| Avg Precip (In.) | .28 | .27 | .5 | 1.27 | 1.9 | 1.09 | .8 | .54 | .93 | .85 | .47 | .37 | 9.27 |