Snoqualmie Pass, Washington has a Continental Subarctic - Cold Dry Summer climate (Köppen classification: Dsc). Average annual temperatures range from 35.9 °F (low) to 51.9 °F (high). Annual precipitation averages 88.9 Inches. Snoqualmie Pass is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.2 °F | 35.4 °F | 14.57 in. |
| February | 26.6 °F | 38.5 °F | 8.66 in. |
| March | 28.7 °F | 43.3 °F | 11.42 in. |
| April | 32.2 °F | 48.4 °F | 6.61 in. |
| May | 37.7 °F | 56.8 °F | 3.95 in. |
| June | 42.9 °F | 62.5 °F | 2.78 in. |
| July | 48.8 °F | 71.6 °F | 1.47 in. |
| August | 49.3 °F | 72.6 °F | 1.6 in. |
| September | 44.4 °F | 65.9 °F | 4.16 in. |
| October | 37.5 °F | 52.9 °F | 7.93 in. |
| November | 30.8 °F | 40.6 °F | 13.83 in. |
| December | 25.7 °F | 34.0 °F | 11.93 in. |
| Annual | 35.9 °F | 51.9 °F | 88.91 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsc - Continental Subarctic - Cold Dry Summer |