Skykomish, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 40.3 °F (low) to 59.1 °F (high). Annual precipitation averages 101.2 Inches. 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 | 30.9 °F | 41.6 °F | 14.53 in. |
| February | 31.2 °F | 46.0 °F | 10.06 in. |
| March | 33.5 °F | 50.9 °F | 10.6 in. |
| April | 37.5 °F | 59.2 °F | 8.11 in. |
| May | 43.7 °F | 66.8 °F | 5.06 in. |
| June | 48.0 °F | 70.8 °F | 4.08 in. |
| July | 52.2 °F | 77.0 °F | 1.58 in. |
| August | 51.9 °F | 77.9 °F | 1.74 in. |
| September | 47.6 °F | 71.4 °F | 4.53 in. |
| October | 40.9 °F | 59.9 °F | 10.66 in. |
| November | 35.1 °F | 47.5 °F | 16.57 in. |
| December | 30.6 °F | 40.6 °F | 13.68 in. |
| Annual | 40.3 °F | 59.1 °F | 101.2 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |