Deer Trail, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.3 °C (low) to 18 °C (high). Annual precipitation averages 426.7 Millimeters. Deer Trail is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.8 °C | 6.1 °C | 10.16 mm |
| February | -8.5 °C | 7.1 °C | 10.92 mm |
| March | -4 °C | 12.5 °C | 28.45 mm |
| April | -0.2 °C | 16.2 °C | 51.56 mm |
| May | 5.2 °C | 21.4 °C | 63.5 mm |
| June | 10.6 °C | 28.1 °C | 47.5 mm |
| July | 14.2 °C | 31.9 °C | 68.83 mm |
| August | 13.2 °C | 30.4 °C | 56.64 mm |
| September | 8.3 °C | 26.3 °C | 24.89 mm |
| October | 0.9 °C | 18.6 °C | 28.45 mm |
| November | -5.1 °C | 11.4 °C | 20.57 mm |
| December | -9.7 °C | 5.9 °C | 15.24 mm |
| Annual | 1.3 °C | 18 °C | 426.71 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |