Darrington, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5 °C (low) to 15.1 °C (high). Annual precipitation averages 2098.8 Millimeters. Darrington is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.3 °C | 5.7 °C | 314.2 mm |
| February | 0 °C | 7.8 °C | 204.72 mm |
| March | 1.3 °C | 10.6 °C | 247.9 mm |
| April | 3.6 °C | 14.5 °C | 146.05 mm |
| May | 6.8 °C | 18.7 °C | 98.04 mm |
| June | 9.4 °C | 21.7 °C | 67.82 mm |
| July | 11.5 °C | 25.7 °C | 33.27 mm |
| August | 11.5 °C | 26.3 °C | 46.99 mm |
| September | 8.9 °C | 21.9 °C | 90.42 mm |
| October | 5.2 °C | 14.6 °C | 218.19 mm |
| November | 2 °C | 8.6 °C | 342.14 mm |
| December | -0.3 °C | 5.1 °C | 289.05 mm |
| Annual | 5 °C | 15.1 °C | 2098.79 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |