Washtucna, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 39.8 °F (low) to 63.7 °F (high). Annual precipitation averages 12.1 Inches. Washtucna is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.2 °F | 39.4 °F | 1.52 in. |
| February | 29.0 °F | 45.8 °F | 1.1 in. |
| March | 33.1 °F | 54.8 °F | 1.31 in. |
| April | 37.5 °F | 62.9 °F | 1.06 in. |
| May | 44.1 °F | 72.3 °F | 0.98 in. |
| June | 49.7 °F | 79.4 °F | 0.84 in. |
| July | 55.6 °F | 89.4 °F | 0.28 in. |
| August | 55.4 °F | 89.1 °F | 0.25 in. |
| September | 48.1 °F | 79.3 °F | 0.38 in. |
| October | 39.0 °F | 64.3 °F | 0.98 in. |
| November | 31.9 °F | 48.6 °F | 1.59 in. |
| December | 26.7 °F | 38.6 °F | 1.77 in. |
| Annual | 39.8 °F | 63.7 °F | 12.06 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |