Latah, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 36 °F (low) to 58.5 °F (high). Annual precipitation averages 20.7 Inches. Latah 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 | 24.8 °F | 36.6 °F | 2.52 in. |
| February | 25.8 °F | 40.8 °F | 1.79 in. |
| March | 29.7 °F | 48.6 °F | 2.2 in. |
| April | 34.4 °F | 56.6 °F | 1.72 in. |
| May | 40.7 °F | 65.9 °F | 1.99 in. |
| June | 46.0 °F | 72.0 °F | 1.65 in. |
| July | 49.8 °F | 83.4 °F | 0.61 in. |
| August | 49.5 °F | 84.1 °F | 0.48 in. |
| September | 42.5 °F | 74.4 °F | 0.7 in. |
| October | 34.9 °F | 59.4 °F | 1.64 in. |
| November | 29.4 °F | 44.2 °F | 2.56 in. |
| December | 24.2 °F | 35.5 °F | 2.8 in. |
| Annual | 36 °F | 58.5 °F | 20.66 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 | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |