Salmon Creek, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.5 °C (low) to 17 °C (high). Annual precipitation averages 1035.8 Millimeters. Salmon Creek is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.7 °C | 8.2 °C | 152.4 mm |
| February | 1.7 °C | 10.3 °C | 107.19 mm |
| March | 3.3 °C | 13.1 °C | 120.4 mm |
| April | 5.1 °C | 15.9 °C | 78.99 mm |
| May | 8.2 °C | 19.8 °C | 57.66 mm |
| June | 10.5 °C | 22.4 °C | 44.96 mm |
| July | 12.7 °C | 26.6 °C | 11.18 mm |
| August | 12.7 °C | 27.2 °C | 15.24 mm |
| September | 10.2 °C | 24.1 °C | 38.35 mm |
| October | 6.6 °C | 17.6 °C | 92.71 mm |
| November | 3.7 °C | 11.5 °C | 139.45 mm |
| December | 1.6 °C | 7.8 °C | 177.29 mm |
| Annual | 6.5 °C | 17 °C | 1035.82 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |