Kamiah, Idaho has a Humid Continental Climate - Dry Warm Summer climate (Köppen classification: Dsa). Average annual temperatures range from 4.3 °C (low) to 17.7 °C (high). Annual precipitation averages 576.8 Millimeters. Kamiah is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.2 °C | 4.2 °C | 50.04 mm |
| February | -1.5 °C | 7.9 °C | 42.42 mm |
| March | 0.6 °C | 12.9 °C | 61.47 mm |
| April | 3.3 °C | 17.3 °C | 70.87 mm |
| May | 6.9 °C | 22.4 °C | 66.04 mm |
| June | 10.1 °C | 26.2 °C | 58.42 mm |
| July | 12.6 °C | 32.8 °C | 22.61 mm |
| August | 11.9 °C | 33.1 °C | 19.81 mm |
| September | 8.2 °C | 26.8 °C | 26.42 mm |
| October | 3.8 °C | 17.2 °C | 45.21 mm |
| November | 0.4 °C | 8.5 °C | 65.02 mm |
| December | -2.4 °C | 3.4 °C | 48.51 mm |
| Annual | 4.3 °C | 17.7 °C | 576.84 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsa - Humid Continental Climate - Dry Warm Summer |