Ellicott, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 33.6 °F (low) to 62.6 °F (high). Annual precipitation averages 15.4 Inches. Ellicott is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.8 °F | 42.5 °F | 0.27 in. |
| February | 16.6 °F | 44.6 °F | 0.33 in. |
| March | 24.0 °F | 53.0 °F | 0.69 in. |
| April | 31.1 °F | 59.6 °F | 1.35 in. |
| May | 40.3 °F | 68.8 °F | 1.71 in. |
| June | 49.5 °F | 80.4 °F | 1.64 in. |
| July | 55.8 °F | 85.6 °F | 2.91 in. |
| August | 54.3 °F | 82.4 °F | 3.71 in. |
| September | 45.6 °F | 76.1 °F | 1.22 in. |
| October | 33.7 °F | 63.5 °F | 0.9 in. |
| November | 22.8 °F | 51.2 °F | 0.36 in. |
| December | 15.1 °F | 43.0 °F | 0.34 in. |
| Annual | 33.6 °F | 62.6 °F | 15.43 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |