Naselle, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.1 °F (low) to 59.8 °F (high). Annual precipitation averages 95.7 Inches. Naselle 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.9 °F | 48.9 °F | 15.25 in. |
| February | 36.0 °F | 50.8 °F | 9.84 in. |
| March | 37.5 °F | 53.4 °F | 10.69 in. |
| April | 40.1 °F | 57.9 °F | 7.25 in. |
| May | 44.9 °F | 63.0 °F | 4.01 in. |
| June | 48.8 °F | 66.5 °F | 2.97 in. |
| July | 52.2 °F | 70.8 °F | 1.09 in. |
| August | 52.4 °F | 72.4 °F | 1.52 in. |
| September | 49.1 °F | 70.5 °F | 3.68 in. |
| October | 43.5 °F | 62.3 °F | 9.24 in. |
| November | 39.1 °F | 53.4 °F | 14.55 in. |
| December | 36.1 °F | 48.1 °F | 15.62 in. |
| Annual | 43.1 °F | 59.8 °F | 95.71 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Csb - Warm-Summer Mediterranean Climate |