Silverdale, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.8 °C (low) to 14.4 °C (high). Annual precipitation averages 1138.2 Millimeters. Silverdale is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 8.5 °C | 180.59 mm |
| February | 2.2 °C | 9.8 °C | 104.39 mm |
| March | 3.5 °C | 12.1 °C | 123.95 mm |
| April | 5.2 °C | 12.8 °C | 77.98 mm |
| May | 8.2 °C | 16.2 °C | 51.82 mm |
| June | 10.6 °C | 18.2 °C | 40.89 mm |
| July | 12.4 °C | 21.3 °C | 20.83 mm |
| August | 12.6 °C | 21.9 °C | 25.4 mm |
| September | 10.6 °C | 19.3 °C | 44.96 mm |
| October | 7.2 °C | 14.2 °C | 107.44 mm |
| November | 4.1 °C | 10.8 °C | 172.97 mm |
| December | 2.2 °C | 8 °C | 186.94 mm |
| Annual | 6.8 °C | 14.4 °C | 1138.16 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°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 |