Cusick, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 33.8 °F (low) to 58.5 °F (high). Annual precipitation averages 24.4 Inches. Cusick is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.6 °F | 33.6 °F | 3.0 in. |
| February | 22.1 °F | 39.7 °F | 1.94 in. |
| March | 27.0 °F | 48.9 °F | 2.55 in. |
| April | 32.0 °F | 58.1 °F | 1.98 in. |
| May | 39.5 °F | 68.3 °F | 2.06 in. |
| June | 44.9 °F | 74.3 °F | 2.09 in. |
| July | 49.0 °F | 84.9 °F | 0.82 in. |
| August | 47.7 °F | 85.2 °F | 0.66 in. |
| September | 40.5 °F | 74.8 °F | 0.81 in. |
| October | 32.8 °F | 58.5 °F | 2.01 in. |
| November | 27.5 °F | 42.0 °F | 2.99 in. |
| December | 21.5 °F | 33.2 °F | 3.46 in. |
| Annual | 33.8 °F | 58.5 °F | 24.37 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |