Forks, Washington has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 42.6 °F (low) to 58.6 °F (high). Annual precipitation averages 116.1 Inches. Forks is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.3 °F | 46.6 °F | 18.53 in. |
| February | 35.9 °F | 48.7 °F | 11.35 in. |
| March | 37.2 °F | 51.3 °F | 13.65 in. |
| April | 39.5 °F | 56.4 °F | 9.17 in. |
| May | 44.0 °F | 63.0 °F | 4.78 in. |
| June | 48.1 °F | 66.9 °F | 3.67 in. |
| July | 51.1 °F | 71.8 °F | 1.97 in. |
| August | 51.4 °F | 73.2 °F | 2.64 in. |
| September | 48.7 °F | 69.3 °F | 4.53 in. |
| October | 43.9 °F | 59.8 °F | 11.12 in. |
| November | 39.1 °F | 50.6 °F | 17.61 in. |
| December | 35.8 °F | 45.7 °F | 17.03 in. |
| Annual | 42.6 °F | 58.6 °F | 116.05 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |