| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°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 1b: -15F to -10F | |
| Average First Frost Date: | Sep.11 - Sep. 20 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | Dfc - Subarctic With Cool Summers And Year Around Rainfall | |
| Ecoregion: | 21h - Volcanic Mid-Elevation Forests and Shrublands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 81154 - South Fork, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 8 | 17 | 22 | 31 | 38 | 44 | 43 | 36 | 26 | 14 | 5 | 24 |
| Avg Max Temp (°F) | 33 | 38 | 45 | 50 | 61 | 70 | 74 | 72 | 67 | 57 | 44 | 35 | 54 |
| Avg Precip (In.) | .36 | .36 | .79 | .83 | .92 | .67 | 1.71 | 1.94 | 1.13 | 1.12 | .7 | .51 | 11.05 |