Priest River, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 34.8 °F (low) to 57.6 °F (high). Annual precipitation averages 25.4 Inches. 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 | 22.8 °F | 34.3 °F | 3.26 in. |
| February | 23.1 °F | 39.0 °F | 2.11 in. |
| March | 27.5 °F | 47.6 °F | 2.68 in. |
| April | 32.7 °F | 56.7 °F | 2.14 in. |
| May | 40.1 °F | 67.3 °F | 2.09 in. |
| June | 45.8 °F | 73.2 °F | 1.99 in. |
| July | 49.9 °F | 83.5 °F | 0.77 in. |
| August | 48.7 °F | 83.7 °F | 0.72 in. |
| September | 41.5 °F | 72.9 °F | 0.87 in. |
| October | 33.9 °F | 56.9 °F | 1.99 in. |
| November | 28.2 °F | 42.1 °F | 3.14 in. |
| December | 22.8 °F | 33.8 °F | 3.68 in. |
| Annual | 34.8 °F | 57.6 °F | 25.44 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |