Somerset, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.4 °F (low) to 62.7 °F (high). Annual precipitation averages 16.6 Inches. Somerset is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.8 °F | 37.0 °F | 1.42 in. |
| February | 17.3 °F | 42.7 °F | 1.46 in. |
| March | 24.9 °F | 53.3 °F | 1.38 in. |
| April | 31.0 °F | 61.4 °F | 1.71 in. |
| May | 39.0 °F | 71.3 °F | 1.44 in. |
| June | 46.9 °F | 82.7 °F | 0.61 in. |
| July | 53.4 °F | 88.5 °F | 1.27 in. |
| August | 51.8 °F | 85.5 °F | 1.35 in. |
| September | 43.9 °F | 77.7 °F | 1.87 in. |
| October | 32.9 °F | 65.1 °F | 1.51 in. |
| November | 22.5 °F | 50.3 °F | 1.16 in. |
| December | 12.9 °F | 37.4 °F | 1.45 in. |
| Annual | 32.4 °F | 62.7 °F | 16.63 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |