Easton, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.2 °C (low) to 12.8 °C (high). Annual precipitation averages 1165.9 Millimeters. 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 | -4.2 °C | 1.7 °C | 191.01 mm |
| February | -3.9 °C | 4.3 °C | 125.48 mm |
| March | -2.2 °C | 7.7 °C | 121.92 mm |
| April | 0.6 °C | 11.3 °C | 75.95 mm |
| May | 4.3 °C | 16.4 °C | 52.32 mm |
| June | 7.8 °C | 19.6 °C | 38.1 mm |
| July | 10.8 °C | 24.8 °C | 11.94 mm |
| August | 10.4 °C | 25.4 °C | 14.22 mm |
| September | 6.5 °C | 21.4 °C | 38.86 mm |
| October | 2.1 °C | 13.7 °C | 102.62 mm |
| November | -1.7 °C | 5.8 °C | 211.07 mm |
| December | -4.4 °C | 1.4 °C | 182.37 mm |
| Annual | 2.2 °C | 12.8 °C | 1165.86 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |