Latah, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.2 °C (low) to 14.7 °C (high). Annual precipitation averages 524.8 Millimeters. 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 | -4 °C | 2.6 °C | 64.01 mm |
| February | -3.4 °C | 4.9 °C | 45.47 mm |
| March | -1.3 °C | 9.2 °C | 55.88 mm |
| April | 1.3 °C | 13.7 °C | 43.69 mm |
| May | 4.8 °C | 18.8 °C | 50.55 mm |
| June | 7.8 °C | 22.2 °C | 41.91 mm |
| July | 9.9 °C | 28.6 °C | 15.49 mm |
| August | 9.7 °C | 28.9 °C | 12.19 mm |
| September | 5.8 °C | 23.6 °C | 17.78 mm |
| October | 1.6 °C | 15.2 °C | 41.66 mm |
| November | -1.4 °C | 6.8 °C | 65.02 mm |
| December | -4.3 °C | 1.9 °C | 71.12 mm |
| Annual | 2.2 °C | 14.7 °C | 524.77 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 | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |