Delta, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 3 °C (low) to 19.3 °C (high). Annual precipitation averages 191 Millimeters. Delta is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 4.4 °C | 9.4 mm |
| February | -5.1 °C | 8.5 °C | 10.67 mm |
| March | -1.3 °C | 14.6 °C | 12.45 mm |
| April | 2.2 °C | 19 °C | 14.73 mm |
| May | 7.2 °C | 24.5 °C | 17.53 mm |
| June | 11.7 °C | 31.2 °C | 9.91 mm |
| July | 15.2 °C | 33.6 °C | 17.78 mm |
| August | 14 °C | 31.7 °C | 21.08 mm |
| September | 9.2 °C | 27.6 °C | 30.73 mm |
| October | 2.6 °C | 20.3 °C | 23.37 mm |
| November | -3.3 °C | 11.9 °C | 13.21 mm |
| December | -8.1 °C | 4.6 °C | 10.16 mm |
| Annual | 3 °C | 19.3 °C | 191.02 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |