Carnation, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.4 °F (low) to 61.2 °F (high). Annual precipitation averages 45.7 Inches. Carnation is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.9 °F | 47.1 °F | 5.64 in. |
| February | 35.9 °F | 50.1 °F | 4.33 in. |
| March | 38.4 °F | 54.1 °F | 4.69 in. |
| April | 41.9 °F | 59.5 °F | 4.08 in. |
| May | 47.2 °F | 66.2 °F | 2.7 in. |
| June | 51.6 °F | 70.2 °F | 2.49 in. |
| July | 54.9 °F | 77.2 °F | 0.98 in. |
| August | 55.1 °F | 78.1 °F | 1.08 in. |
| September | 51.2 °F | 72.2 °F | 2.33 in. |
| October | 45.1 °F | 61.5 °F | 4.64 in. |
| November | 39.4 °F | 51.9 °F | 6.46 in. |
| December | 35.6 °F | 46.2 °F | 6.27 in. |
| Annual | 44.4 °F | 61.2 °F | 45.69 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |