Fairwood, Washington has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 43.4 °F (low) to 60 °F (high). Annual precipitation averages 45.3 Inches. Fairwood is located in USDA Plant Hardiness Zone 8b. 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 | 35.2 °F | 46.3 °F | 6.04 in. |
| February | 35.1 °F | 48.9 °F | 4.28 in. |
| March | 37.3 °F | 52.9 °F | 4.87 in. |
| April | 40.6 °F | 58.0 °F | 3.89 in. |
| May | 46.2 °F | 65.0 °F | 2.5 in. |
| June | 50.4 °F | 69.5 °F | 2.16 in. |
| July | 54.1 °F | 76.3 °F | 0.93 in. |
| August | 54.4 °F | 76.7 °F | 1.18 in. |
| September | 50.4 °F | 70.8 °F | 1.97 in. |
| October | 44.0 °F | 59.7 °F | 4.61 in. |
| November | 38.5 °F | 50.8 °F | 6.63 in. |
| December | 34.7 °F | 45.2 °F | 6.21 in. |
| Annual | 43.4 °F | 60 °F | 45.27 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfb - Temperate Oceanic Climate |