Omak, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 39.7 °F (low) to 62.5 °F (high). Annual precipitation averages 12.2 Inches. Omak is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.6 °F | 34.3 °F | 1.35 in. |
| February | 26.0 °F | 41.1 °F | 1.02 in. |
| March | 31.9 °F | 54.0 °F | 1.18 in. |
| April | 38.4 °F | 64.3 °F | 0.9 in. |
| May | 45.9 °F | 74.1 °F | 1.22 in. |
| June | 52.2 °F | 80.5 °F | 0.88 in. |
| July | 58.3 °F | 90.0 °F | 0.67 in. |
| August | 57.3 °F | 89.5 °F | 0.36 in. |
| September | 48.6 °F | 79.6 °F | 0.38 in. |
| October | 38.6 °F | 62.7 °F | 0.79 in. |
| November | 30.5 °F | 45.3 °F | 1.61 in. |
| December | 24.8 °F | 35.0 °F | 1.82 in. |
| Annual | 39.7 °F | 62.5 °F | 12.18 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |