Douglas, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 8.6 °C (low) to 26.9 °C (high). Annual precipitation averages 321.8 Millimeters. Douglas is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.2 °C | 17.5 °C | 19.3 mm |
| February | 1 °C | 19.4 °C | 13.46 mm |
| March | 3.6 °C | 23 °C | 18.8 mm |
| April | 6.6 °C | 26.7 °C | 4.57 mm |
| May | 11.3 °C | 31.3 °C | 5.33 mm |
| June | 16.7 °C | 35.9 °C | 11.18 mm |
| July | 19.7 °C | 35.1 °C | 77.22 mm |
| August | 19 °C | 33.7 °C | 80.26 mm |
| September | 15.6 °C | 32.5 °C | 38.35 mm |
| October | 8.9 °C | 28.3 °C | 17.02 mm |
| November | 2.8 °C | 22.3 °C | 14.73 mm |
| December | -0.8 °C | 17.2 °C | 21.59 mm |
| Annual | 8.6 °C | 26.9 °C | 321.81 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |