Cowiche, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 37.1 °F (low) to 60.6 °F (high). Annual precipitation averages 10.1 Inches. Cowiche 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.4 °F | 37.2 °F | 1.68 in. |
| February | 25.9 °F | 43.7 °F | 1.15 in. |
| March | 30.3 °F | 52.1 °F | 0.95 in. |
| April | 35.3 °F | 60.0 °F | 0.63 in. |
| May | 42.4 °F | 69.3 °F | 0.84 in. |
| June | 48.1 °F | 75.9 °F | 0.57 in. |
| July | 54.0 °F | 85.0 °F | 0.37 in. |
| August | 53.1 °F | 84.2 °F | 0.15 in. |
| September | 45.6 °F | 75.6 °F | 0.33 in. |
| October | 36.0 °F | 61.2 °F | 0.9 in. |
| November | 28.0 °F | 46.5 °F | 0.92 in. |
| December | 22.6 °F | 36.2 °F | 1.65 in. |
| Annual | 37.1 °F | 60.6 °F | 10.14 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |