Colville, Washington has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 15.2 °C (high). Annual precipitation averages 502.9 Millimeters. Colville 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 0.9 °C | 56.64 mm |
| February | -4.7 °C | 4.7 °C | 36.07 mm |
| March | -1.9 °C | 10.3 °C | 48.51 mm |
| April | 0.9 °C | 15.4 °C | 36.32 mm |
| May | 5.3 °C | 20.9 °C | 51.31 mm |
| June | 8.4 °C | 24.1 °C | 54.61 mm |
| July | 10.9 °C | 29.9 °C | 21.59 mm |
| August | 10.3 °C | 30.2 °C | 16 mm |
| September | 6.4 °C | 24.4 °C | 19.56 mm |
| October | 1.4 °C | 15.1 °C | 38.86 mm |
| November | -1.8 °C | 6.1 °C | 56.64 mm |
| December | -5.2 °C | 0.9 °C | 66.8 mm |
| Annual | 2.1 °C | 15.2 °C | 502.91 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |