Clallam Bay, Washington has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 6.5 °C (low) to 13.1 °C (high). Annual precipitation averages 2039.9 Millimeters. Clallam Bay is located in USDA Plant Hardiness Zone 9a. 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 | 3.4 °C | 8.4 °C | 352.04 mm |
| February | 3.1 °C | 9.2 °C | 208.28 mm |
| March | 3.8 °C | 10.6 °C | 229.62 mm |
| April | 5 °C | 12.3 °C | 134.11 mm |
| May | 7.2 °C | 14.4 °C | 74.93 mm |
| June | 9.5 °C | 16.2 °C | 52.32 mm |
| July | 10.6 °C | 17.7 °C | 36.83 mm |
| August | 11.1 °C | 18 °C | 38.35 mm |
| September | 9.6 °C | 17.3 °C | 57.91 mm |
| October | 7.3 °C | 14.1 °C | 180.34 mm |
| November | 4.7 °C | 10.7 °C | 335.28 mm |
| December | 2.9 °C | 8.3 °C | 339.85 mm |
| Annual | 6.5 °C | 13.1 °C | 2039.86 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 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfb - Temperate Oceanic Climate |