Danville, Washington has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.8 °C (low) to 14.5 °C (high). Annual precipitation averages 532.6 Millimeters. Danville is located in USDA Plant Hardiness Zone 6a. 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 | -6.6 °C | -0.8 °C | 59.44 mm |
| February | -5.7 °C | 3.2 °C | 36.32 mm |
| March | -2.2 °C | 9.4 °C | 39.88 mm |
| April | 1.1 °C | 15.4 °C | 38.86 mm |
| May | 5.5 °C | 20.7 °C | 58.67 mm |
| June | 8.8 °C | 23.9 °C | 69.85 mm |
| July | 11.2 °C | 29.2 °C | 30.99 mm |
| August | 10.6 °C | 29.7 °C | 21.84 mm |
| September | 6.6 °C | 23.9 °C | 23.37 mm |
| October | 1.4 °C | 14.2 °C | 43.18 mm |
| November | -2.4 °C | 5.1 °C | 49.02 mm |
| December | -6.2 °C | -0.3 °C | 61.21 mm |
| Annual | 1.8 °C | 14.5 °C | 532.63 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |