Carnation, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.9 °C (low) to 16.2 °C (high). Annual precipitation averages 1160.5 Millimeters. 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 | 2.2 °C | 8.4 °C | 143.26 mm |
| February | 2.2 °C | 10.1 °C | 109.98 mm |
| March | 3.6 °C | 12.3 °C | 119.13 mm |
| April | 5.5 °C | 15.3 °C | 103.63 mm |
| May | 8.4 °C | 19 °C | 68.58 mm |
| June | 10.9 °C | 21.2 °C | 63.25 mm |
| July | 12.7 °C | 25.1 °C | 24.89 mm |
| August | 12.8 °C | 25.6 °C | 27.43 mm |
| September | 10.7 °C | 22.3 °C | 59.18 mm |
| October | 7.3 °C | 16.4 °C | 117.86 mm |
| November | 4.1 °C | 11.1 °C | 164.08 mm |
| December | 2 °C | 7.9 °C | 159.26 mm |
| Annual | 6.9 °C | 16.2 °C | 1160.53 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |