Neilton, Washington has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 42 °F (low) to 59.3 °F (high). Annual precipitation averages 152.2 Inches. Neilton 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 | 35.1 °F | 45.5 °F | 25.64 in. |
| February | 34.6 °F | 48.3 °F | 13.3 in. |
| March | 36.4 °F | 51.9 °F | 17.83 in. |
| April | 38.8 °F | 58.4 °F | 11.29 in. |
| May | 43.8 °F | 64.5 °F | 6.42 in. |
| June | 48.0 °F | 69.3 °F | 4.11 in. |
| July | 51.3 °F | 74.6 °F | 1.9 in. |
| August | 51.7 °F | 75.3 °F | 3.56 in. |
| September | 48.7 °F | 71.1 °F | 4.99 in. |
| October | 43.4 °F | 59.1 °F | 14.72 in. |
| November | 38.0 °F | 49.8 °F | 22.59 in. |
| December | 34.7 °F | 44.3 °F | 25.87 in. |
| Annual | 42 °F | 59.3 °F | 152.22 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 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfb - Temperate Oceanic Climate |