Lone Tree, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 36 °F (low) to 64.1 °F (high). Annual precipitation averages 18.5 Inches. Lone Tree 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.1 °F | 45.2 °F | 0.65 in. |
| February | 19.3 °F | 46.0 °F | 0.72 in. |
| March | 26.6 °F | 54.3 °F | 1.6 in. |
| April | 32.6 °F | 60.3 °F | 2.43 in. |
| May | 41.9 °F | 69.1 °F | 2.44 in. |
| June | 51.5 °F | 81.1 °F | 2.07 in. |
| July | 57.7 °F | 87.2 °F | 2.07 in. |
| August | 56.0 °F | 84.9 °F | 2.33 in. |
| September | 47.8 °F | 77.9 °F | 1.49 in. |
| October | 35.7 °F | 65.2 °F | 1.2 in. |
| November | 26.1 °F | 53.6 °F | 0.89 in. |
| December | 18.1 °F | 44.6 °F | 0.64 in. |
| Annual | 36 °F | 64.1 °F | 18.53 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |