Wilkeson, Washington has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 41.3 °F (low) to 58.8 °F (high). Annual precipitation averages 53.7 Inches. Wilkeson is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.4 °F | 44.8 °F | 6.91 in. |
| February | 33.3 °F | 47.3 °F | 4.87 in. |
| March | 35.2 °F | 51.6 °F | 5.87 in. |
| April | 38.3 °F | 56.4 °F | 4.85 in. |
| May | 43.9 °F | 63.5 °F | 3.84 in. |
| June | 48.1 °F | 68.2 °F | 3.31 in. |
| July | 51.9 °F | 74.9 °F | 1.33 in. |
| August | 52.2 °F | 76.3 °F | 1.47 in. |
| September | 48.1 °F | 70.4 °F | 2.31 in. |
| October | 41.8 °F | 59.4 °F | 5.21 in. |
| November | 36.4 °F | 49.4 °F | 7.49 in. |
| December | 32.6 °F | 43.6 °F | 6.28 in. |
| Annual | 41.3 °F | 58.8 °F | 53.74 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfb - Temperate Oceanic Climate |