Easton, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 35.9 °F (low) to 55 °F (high). Annual precipitation averages 45.9 Inches. Easton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.5 °F | 35.0 °F | 7.52 in. |
| February | 24.9 °F | 39.8 °F | 4.94 in. |
| March | 28.1 °F | 45.9 °F | 4.8 in. |
| April | 33.0 °F | 52.4 °F | 2.99 in. |
| May | 39.8 °F | 61.5 °F | 2.06 in. |
| June | 46.1 °F | 67.2 °F | 1.5 in. |
| July | 51.5 °F | 76.7 °F | 0.47 in. |
| August | 50.8 °F | 77.8 °F | 0.56 in. |
| September | 43.7 °F | 70.5 °F | 1.53 in. |
| October | 35.7 °F | 56.6 °F | 4.04 in. |
| November | 29.0 °F | 42.5 °F | 8.31 in. |
| December | 24.1 °F | 34.6 °F | 7.18 in. |
| Annual | 35.9 °F | 55 °F | 45.9 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |