Clallam Bay, Washington has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 43.7 °F (low) to 55.6 °F (high). Annual precipitation averages 80.3 Inches. 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 | 38.1 °F | 47.1 °F | 13.86 in. |
| February | 37.5 °F | 48.5 °F | 8.2 in. |
| March | 38.9 °F | 51.0 °F | 9.04 in. |
| April | 41.0 °F | 54.2 °F | 5.28 in. |
| May | 45.0 °F | 58.0 °F | 2.95 in. |
| June | 49.1 °F | 61.1 °F | 2.06 in. |
| July | 51.0 °F | 63.8 °F | 1.45 in. |
| August | 51.9 °F | 64.4 °F | 1.51 in. |
| September | 49.3 °F | 63.2 °F | 2.28 in. |
| October | 45.1 °F | 57.3 °F | 7.1 in. |
| November | 40.5 °F | 51.3 °F | 13.2 in. |
| December | 37.3 °F | 46.9 °F | 13.38 in. |
| Annual | 43.7 °F | 55.6 °F | 80.31 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfb - Temperate Oceanic Climate |