Snoqualmie, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.1 °F (low) to 59.8 °F (high). Annual precipitation averages 62.9 Inches. Snoqualmie 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.8 °F | 46.0 °F | 8.67 in. |
| February | 34.8 °F | 48.8 °F | 5.73 in. |
| March | 36.9 °F | 53.0 °F | 6.69 in. |
| April | 40.3 °F | 58.0 °F | 5.27 in. |
| May | 46.0 °F | 64.7 °F | 3.81 in. |
| June | 50.2 °F | 68.6 °F | 3.1 in. |
| July | 53.9 °F | 75.7 °F | 1.3 in. |
| August | 54.0 °F | 76.9 °F | 1.34 in. |
| September | 49.9 °F | 70.9 °F | 2.9 in. |
| October | 43.6 °F | 59.9 °F | 6.03 in. |
| November | 38.3 °F | 50.7 °F | 9.58 in. |
| December | 34.3 °F | 44.7 °F | 8.49 in. |
| Annual | 43.1 °F | 59.8 °F | 62.91 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |