White Swan, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 38.2 °F (low) to 64.2 °F (high). Annual precipitation averages 8.4 Inches. 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 | 24.7 °F | 39.2 °F | 1.64 in. |
| February | 27.0 °F | 47.0 °F | 0.8 in. |
| March | 31.7 °F | 56.0 °F | 0.68 in. |
| April | 36.7 °F | 64.3 °F | 0.54 in. |
| May | 44.2 °F | 74.0 °F | 0.51 in. |
| June | 49.6 °F | 80.1 °F | 0.37 in. |
| July | 54.9 °F | 89.3 °F | 0.19 in. |
| August | 53.6 °F | 88.6 °F | 0.17 in. |
| September | 46.2 °F | 79.6 °F | 0.19 in. |
| October | 36.9 °F | 65.1 °F | 0.55 in. |
| November | 29.0 °F | 49.2 °F | 1.04 in. |
| December | 24.0 °F | 38.4 °F | 1.68 in. |
| Annual | 38.2 °F | 64.2 °F | 8.36 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |