Windsor, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.4 °C (low) to 17.5 °C (high). Annual precipitation averages 330.5 Millimeters. 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 | -10 °C | 5.1 °C | 8.38 mm |
| February | -8.6 °C | 6.4 °C | 9.14 mm |
| March | -3.8 °C | 12.6 °C | 19.56 mm |
| April | 0.4 °C | 16.3 °C | 46.23 mm |
| May | 6.1 °C | 21.2 °C | 59.18 mm |
| June | 11.3 °C | 27.9 °C | 41.66 mm |
| July | 14.2 °C | 31.2 °C | 29.21 mm |
| August | 12.8 °C | 29.9 °C | 36.07 mm |
| September | 7.8 °C | 25.7 °C | 28.45 mm |
| October | 1.1 °C | 18.1 °C | 26.67 mm |
| November | -5.1 °C | 10.7 °C | 13.97 mm |
| December | -9.9 °C | 4.9 °C | 11.94 mm |
| Annual | 1.4 °C | 17.5 °C | 330.46 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |