Fort Carson, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2.1 °C (low) to 17.4 °C (high). Annual precipitation averages 445 Millimeters. Fort Carson is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 6.7 °C | 9.4 mm |
| February | -7.3 °C | 7.6 °C | 12.19 mm |
| March | -3.4 °C | 12.2 °C | 27.18 mm |
| April | 0.3 °C | 15.3 °C | 39.88 mm |
| May | 5.7 °C | 20.5 °C | 46.99 mm |
| June | 10.8 °C | 27.1 °C | 54.1 mm |
| July | 14.2 °C | 30.3 °C | 83.31 mm |
| August | 13.3 °C | 28.6 °C | 93.98 mm |
| September | 8.6 °C | 24.9 °C | 34.04 mm |
| October | 2 °C | 17.7 °C | 24.13 mm |
| November | -3.7 °C | 11.3 °C | 10.92 mm |
| December | -7.8 °C | 6.6 °C | 8.89 mm |
| Annual | 2.1 °C | 17.4 °C | 445.01 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |