Entiat, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 5.4 °C (low) to 17.3 °C (high). Annual precipitation averages 320.3 Millimeters. Entiat is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.4 °C | 2.1 °C | 49.78 mm |
| February | -2.1 °C | 6.4 °C | 26.42 mm |
| March | 0.9 °C | 12.3 °C | 31.24 mm |
| April | 4.3 °C | 17.8 °C | 19.81 mm |
| May | 8.6 °C | 23.3 °C | 23.37 mm |
| June | 12 °C | 26.9 °C | 16 mm |
| July | 15.5 °C | 32.3 °C | 7.11 mm |
| August | 15.2 °C | 31.9 °C | 6.1 mm |
| September | 11.1 °C | 26.6 °C | 9.14 mm |
| October | 5.3 °C | 17.8 °C | 28.45 mm |
| November | 0.6 °C | 8.3 °C | 42.42 mm |
| December | -2.9 °C | 2.2 °C | 60.45 mm |
| Annual | 5.4 °C | 17.3 °C | 320.29 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |