Wilkeson, Washington has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 5.1 °C (low) to 14.9 °C (high). Annual precipitation averages 1365 Millimeters. 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 | 0.8 °C | 7.1 °C | 175.51 mm |
| February | 0.7 °C | 8.5 °C | 123.7 mm |
| March | 1.8 °C | 10.9 °C | 149.1 mm |
| April | 3.5 °C | 13.6 °C | 123.19 mm |
| May | 6.6 °C | 17.5 °C | 97.54 mm |
| June | 8.9 °C | 20.1 °C | 84.07 mm |
| July | 11.1 °C | 23.8 °C | 33.78 mm |
| August | 11.2 °C | 24.6 °C | 37.34 mm |
| September | 8.9 °C | 21.3 °C | 58.67 mm |
| October | 5.4 °C | 15.2 °C | 132.33 mm |
| November | 2.4 °C | 9.7 °C | 190.25 mm |
| December | 0.3 °C | 6.4 °C | 159.51 mm |
| Annual | 5.1 °C | 14.9 °C | 1364.99 mm |
| 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 : -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 | Cfb - Temperate Oceanic Climate |