South Fork, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 23.8 °F (low) to 56.6 °F (high). Annual precipitation averages 14.2 Inches. South Fork is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.3 °F | 33.3 °F | 0.63 in. |
| February | 5.9 °F | 38.0 °F | 1.14 in. |
| March | 16.1 °F | 47.6 °F | 1.25 in. |
| April | 23.6 °F | 55.1 °F | 0.8 in. |
| May | 31.9 °F | 64.3 °F | 1.18 in. |
| June | 38.7 °F | 74.9 °F | 0.84 in. |
| July | 45.1 °F | 78.3 °F | 1.9 in. |
| August | 44.0 °F | 76.3 °F | 2.07 in. |
| September | 36.5 °F | 71.0 °F | 1.62 in. |
| October | 25.8 °F | 60.1 °F | 1.1 in. |
| November | 13.9 °F | 46.3 °F | 0.65 in. |
| December | 2.7 °F | 34.1 °F | 1.02 in. |
| Annual | 23.8 °F | 56.6 °F | 14.2 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |