Lapwai, Idaho has a Humid Continental Climate - Dry Warm Summer climate (Köppen classification: Dsa). Average annual temperatures range from 5.3 °C (low) to 18.1 °C (high). Annual precipitation averages 428.5 Millimeters. Lapwai is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.4 °C | 5.2 °C | 41.91 mm |
| February | -0.8 °C | 8.4 °C | 38.61 mm |
| March | 1.3 °C | 13.1 °C | 43.69 mm |
| April | 4.2 °C | 17.6 °C | 44.7 mm |
| May | 7.8 °C | 22.6 °C | 43.69 mm |
| June | 11 °C | 26.3 °C | 33.78 mm |
| July | 13.8 °C | 32.8 °C | 19.05 mm |
| August | 13.6 °C | 32.8 °C | 16 mm |
| September | 9.7 °C | 27 °C | 17.53 mm |
| October | 4.9 °C | 17.8 °C | 36.83 mm |
| November | 1.2 °C | 9.4 °C | 46.74 mm |
| December | -1.7 °C | 4.5 °C | 45.97 mm |
| Annual | 5.3 °C | 18.1 °C | 428.5 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsa - Humid Continental Climate - Dry Warm Summer |