Quilcene, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43 °F (low) to 60.6 °F (high). Annual precipitation averages 36.7 Inches. Quilcene is located in USDA Plant Hardiness Zone 8b. 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 | 35.2 °F | 46.9 °F | 5.37 in. |
| February | 35.0 °F | 49.4 °F | 3.87 in. |
| March | 37.3 °F | 53.6 °F | 4.55 in. |
| April | 40.5 °F | 59.4 °F | 2.6 in. |
| May | 45.7 °F | 65.7 °F | 1.58 in. |
| June | 50.1 °F | 69.5 °F | 1.69 in. |
| July | 53.1 °F | 76.0 °F | 0.82 in. |
| August | 53.0 °F | 76.9 °F | 0.75 in. |
| September | 49.3 °F | 71.6 °F | 1.18 in. |
| October | 43.5 °F | 60.7 °F | 2.73 in. |
| November | 38.2 °F | 51.4 °F | 5.23 in. |
| December | 35.0 °F | 46.2 °F | 6.32 in. |
| Annual | 43 °F | 60.6 °F | 36.69 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 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |