Snoqualmie, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.2 °C (low) to 15.5 °C (high). Annual precipitation averages 1597.9 Millimeters. 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 | 1.6 °C | 7.8 °C | 220.22 mm |
| February | 1.6 °C | 9.3 °C | 145.54 mm |
| March | 2.7 °C | 11.7 °C | 169.93 mm |
| April | 4.6 °C | 14.4 °C | 133.86 mm |
| May | 7.8 °C | 18.2 °C | 96.77 mm |
| June | 10.1 °C | 20.3 °C | 78.74 mm |
| July | 12.2 °C | 24.3 °C | 33.02 mm |
| August | 12.2 °C | 24.9 °C | 34.04 mm |
| September | 9.9 °C | 21.6 °C | 73.66 mm |
| October | 6.4 °C | 15.5 °C | 153.16 mm |
| November | 3.5 °C | 10.4 °C | 243.33 mm |
| December | 1.3 °C | 7.1 °C | 215.65 mm |
| Annual | 6.2 °C | 15.5 °C | 1597.92 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |