Douglas City, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 4.8 °C (low) to 21.5 °C (high). Annual precipitation averages 727.5 Millimeters. Douglas City is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.4 °C | 9.5 °C | 146.56 mm |
| February | 0.6 °C | 12.6 °C | 107.95 mm |
| March | 1.6 °C | 16 °C | 95 mm |
| April | 2.9 °C | 19.6 °C | 47.24 mm |
| May | 6.1 °C | 24.7 °C | 36.32 mm |
| June | 8.7 °C | 29.5 °C | 18.03 mm |
| July | 12.1 °C | 34.9 °C | 5.33 mm |
| August | 11.2 °C | 34.7 °C | 3.56 mm |
| September | 7.9 °C | 31.3 °C | 7.87 mm |
| October | 4.1 °C | 23.2 °C | 35.31 mm |
| November | 2.1 °C | 13.8 °C | 73.66 mm |
| December | 0.2 °C | 8.4 °C | 150.62 mm |
| Annual | 4.8 °C | 21.5 °C | 727.45 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |