Priest River, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 1.5 °C (low) to 14.2 °C (high). Annual precipitation averages 646.2 Millimeters. Priest River is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.1 °C | 1.3 °C | 82.8 mm |
| February | -4.9 °C | 3.9 °C | 53.59 mm |
| March | -2.5 °C | 8.7 °C | 68.07 mm |
| April | 0.4 °C | 13.7 °C | 54.36 mm |
| May | 4.5 °C | 19.6 °C | 53.09 mm |
| June | 7.7 °C | 22.9 °C | 50.55 mm |
| July | 9.9 °C | 28.6 °C | 19.56 mm |
| August | 9.3 °C | 28.7 °C | 18.29 mm |
| September | 5.3 °C | 22.7 °C | 22.1 mm |
| October | 1.1 °C | 13.8 °C | 50.55 mm |
| November | -2.1 °C | 5.6 °C | 79.76 mm |
| December | -5.1 °C | 1 °C | 93.47 mm |
| Annual | 1.5 °C | 14.2 °C | 646.19 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |