South Fork, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -4.6 °C (low) to 13.7 °C (high). Annual precipitation averages 360.7 Millimeters. 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 | -17.1 °C | 0.7 °C | 16 mm |
| February | -14.5 °C | 3.3 °C | 28.96 mm |
| March | -8.8 °C | 8.7 °C | 31.75 mm |
| April | -4.7 °C | 12.8 °C | 20.32 mm |
| May | -0.1 °C | 17.9 °C | 29.97 mm |
| June | 3.7 °C | 23.8 °C | 21.34 mm |
| July | 7.3 °C | 25.7 °C | 48.26 mm |
| August | 6.7 °C | 24.6 °C | 52.58 mm |
| September | 2.5 °C | 21.7 °C | 41.15 mm |
| October | -3.4 °C | 15.6 °C | 27.94 mm |
| November | -10.1 °C | 7.9 °C | 16.51 mm |
| December | -16.3 °C | 1.2 °C | 25.91 mm |
| Annual | -4.6 °C | 13.7 °C | 360.69 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |