Ryderwood, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 41.7 °F (low) to 62.2 °F (high). Annual precipitation averages 55.2 Inches. Ryderwood is located in USDA Plant Hardiness Zone 8b. 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 | 34.3 °F | 46.5 °F | 7.7 in. |
| February | 33.8 °F | 50.3 °F | 5.66 in. |
| March | 36.1 °F | 54.6 °F | 5.99 in. |
| April | 39.0 °F | 60.5 °F | 4.69 in. |
| May | 44.3 °F | 67.8 °F | 2.73 in. |
| June | 48.4 °F | 72.3 °F | 2.15 in. |
| July | 52.0 °F | 79.6 °F | 0.58 in. |
| August | 51.9 °F | 80.6 °F | 0.81 in. |
| September | 47.9 °F | 74.8 °F | 2.09 in. |
| October | 42.0 °F | 62.7 °F | 5.18 in. |
| November | 37.1 °F | 51.6 °F | 8.84 in. |
| December | 33.9 °F | 45.4 °F | 8.76 in. |
| Annual | 41.7 °F | 62.2 °F | 55.18 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 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |