Windsor, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 34.4 °F (low) to 63.5 °F (high). Annual precipitation averages 13 Inches. Windsor is located in USDA Plant Hardiness Zone 5b. 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 | 14.0 °F | 41.1 °F | 0.33 in. |
| February | 16.5 °F | 43.6 °F | 0.36 in. |
| March | 25.2 °F | 54.7 °F | 0.77 in. |
| April | 32.7 °F | 61.4 °F | 1.82 in. |
| May | 42.9 °F | 70.1 °F | 2.33 in. |
| June | 52.3 °F | 82.2 °F | 1.64 in. |
| July | 57.5 °F | 88.1 °F | 1.15 in. |
| August | 55.0 °F | 85.8 °F | 1.42 in. |
| September | 46.0 °F | 78.3 °F | 1.12 in. |
| October | 34.0 °F | 64.5 °F | 1.05 in. |
| November | 22.9 °F | 51.2 °F | 0.55 in. |
| December | 14.1 °F | 40.9 °F | 0.47 in. |
| Annual | 34.4 °F | 63.5 °F | 13.01 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 5b : -15°F to -10°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 |