Palouse, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 37 °F (low) to 58.5 °F (high). Annual precipitation averages 23.5 Inches. Palouse is located in USDA Plant Hardiness Zone 6b. 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 | 26.4 °F | 37.3 °F | 3.34 in. |
| February | 27.3 °F | 41.4 °F | 2.22 in. |
| March | 31.1 °F | 48.6 °F | 2.48 in. |
| April | 35.5 °F | 56.2 °F | 2.1 in. |
| May | 41.6 °F | 65.5 °F | 2.11 in. |
| June | 45.9 °F | 71.3 °F | 1.39 in. |
| July | 49.6 °F | 82.9 °F | 0.47 in. |
| August | 49.5 °F | 84.1 °F | 0.6 in. |
| September | 43.7 °F | 74.4 °F | 0.7 in. |
| October | 36.6 °F | 59.6 °F | 1.98 in. |
| November | 31.0 °F | 44.9 °F | 2.77 in. |
| December | 25.6 °F | 36.2 °F | 3.36 in. |
| Annual | 37 °F | 58.5 °F | 23.52 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |