Palouse, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.8 °C (low) to 14.7 °C (high). Annual precipitation averages 597.4 Millimeters. 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 | -3.1 °C | 2.9 °C | 84.84 mm |
| February | -2.6 °C | 5.2 °C | 56.39 mm |
| March | -0.5 °C | 9.2 °C | 62.99 mm |
| April | 1.9 °C | 13.4 °C | 53.34 mm |
| May | 5.3 °C | 18.6 °C | 53.59 mm |
| June | 7.7 °C | 21.8 °C | 35.31 mm |
| July | 9.8 °C | 28.3 °C | 11.94 mm |
| August | 9.7 °C | 28.9 °C | 15.24 mm |
| September | 6.5 °C | 23.6 °C | 17.78 mm |
| October | 2.6 °C | 15.3 °C | 50.29 mm |
| November | -0.6 °C | 7.2 °C | 70.36 mm |
| December | -3.6 °C | 2.3 °C | 85.34 mm |
| Annual | 2.8 °C | 14.7 °C | 597.41 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |