Skykomish, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 4.6 °C (low) to 15.1 °C (high). Annual precipitation averages 2570.5 Millimeters. Skykomish is located in USDA Plant Hardiness Zone 8a. 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 | -0.6 °C | 5.3 °C | 369.06 mm |
| February | -0.4 °C | 7.8 °C | 255.52 mm |
| March | 0.8 °C | 10.5 °C | 269.24 mm |
| April | 3.1 °C | 15.1 °C | 205.99 mm |
| May | 6.5 °C | 19.3 °C | 128.52 mm |
| June | 8.9 °C | 21.6 °C | 103.63 mm |
| July | 11.2 °C | 25 °C | 40.13 mm |
| August | 11.1 °C | 25.5 °C | 44.2 mm |
| September | 8.7 °C | 21.9 °C | 115.06 mm |
| October | 4.9 °C | 15.5 °C | 270.76 mm |
| November | 1.7 °C | 8.6 °C | 420.88 mm |
| December | -0.8 °C | 4.8 °C | 347.47 mm |
| Annual | 4.6 °C | 15.1 °C | 2570.46 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |