White Swan, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 3.4 °C (low) to 17.9 °C (high). Annual precipitation averages 212.4 Millimeters. White Swan is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.1 °C | 4 °C | 41.66 mm |
| February | -2.8 °C | 8.3 °C | 20.32 mm |
| March | -0.2 °C | 13.3 °C | 17.27 mm |
| April | 2.6 °C | 17.9 °C | 13.72 mm |
| May | 6.8 °C | 23.3 °C | 12.95 mm |
| June | 9.8 °C | 26.7 °C | 9.4 mm |
| July | 12.7 °C | 31.8 °C | 4.83 mm |
| August | 12 °C | 31.4 °C | 4.32 mm |
| September | 7.9 °C | 26.4 °C | 4.83 mm |
| October | 2.7 °C | 18.4 °C | 13.97 mm |
| November | -1.7 °C | 9.6 °C | 26.42 mm |
| December | -4.4 °C | 3.6 °C | 42.67 mm |
| Annual | 3.4 °C | 17.9 °C | 212.36 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |