Denver, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 37.8 °F (low) to 65.6 °F (high). Annual precipitation averages 15.8 Inches. Denver 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 | 19.4 °F | 46.4 °F | 0.51 in. |
| February | 20.8 °F | 47.2 °F | 0.61 in. |
| March | 28.7 °F | 56.2 °F | 1.3 in. |
| April | 35.3 °F | 62.0 °F | 2.09 in. |
| May | 44.4 °F | 70.8 °F | 2.35 in. |
| June | 54.0 °F | 83.0 °F | 1.64 in. |
| July | 60.2 °F | 89.2 °F | 2.01 in. |
| August | 58.2 °F | 86.9 °F | 1.72 in. |
| September | 49.5 °F | 79.2 °F | 1.19 in. |
| October | 37.0 °F | 65.9 °F | 1.1 in. |
| November | 27.1 °F | 54.3 °F | 0.75 in. |
| December | 19.1 °F | 45.5 °F | 0.53 in. |
| Annual | 37.8 °F | 65.6 °F | 15.8 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 |