Douglas, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.4 °C (low) to 21.9 °C (high). Annual precipitation averages 870.2 Millimeters. Douglas is located in USDA Plant Hardiness Zone 7a. 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 | -4.3 °C | 8.8 °C | 27.69 mm |
| February | -2.6 °C | 10.9 °C | 36.58 mm |
| March | 2.2 °C | 16.4 °C | 62.48 mm |
| April | 7.1 °C | 21.3 °C | 91.69 mm |
| May | 13.3 °C | 26.3 °C | 120.14 mm |
| June | 18.9 °C | 31.8 °C | 119.38 mm |
| July | 21.3 °C | 34.8 °C | 85.6 mm |
| August | 20.4 °C | 34.2 °C | 88.9 mm |
| September | 16 °C | 29.9 °C | 73.41 mm |
| October | 8.8 °C | 23 °C | 79.5 mm |
| November | 2.2 °C | 15.8 °C | 46.23 mm |
| December | -3 °C | 9.5 °C | 38.61 mm |
| Annual | 8.4 °C | 21.9 °C | 870.21 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |