Bonners Ferry, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.3 °C (low) to 14.2 °C (high). Annual precipitation averages 537.5 Millimeters. Bonners Ferry 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5 °C | 1.1 °C | 71.88 mm |
| February | -4.7 °C | 3.5 °C | 43.18 mm |
| March | -1.8 °C | 8.8 °C | 54.61 mm |
| April | 1.3 °C | 14.4 °C | 36.07 mm |
| May | 5.4 °C | 19.9 °C | 46.23 mm |
| June | 8.9 °C | 23 °C | 45.72 mm |
| July | 11.3 °C | 28.4 °C | 15.75 mm |
| August | 10.5 °C | 28.7 °C | 14.99 mm |
| September | 6.6 °C | 22.6 °C | 24.38 mm |
| October | 1.8 °C | 13.2 °C | 49.53 mm |
| November | -1.6 °C | 5.4 °C | 57.66 mm |
| December | -4.7 °C | 0.8 °C | 77.47 mm |
| Annual | 2.3 °C | 14.2 °C | 537.47 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |