Danville, Washington has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.3 °F (low) to 58 °F (high). Annual precipitation averages 21 Inches. 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 | 20.2 °F | 30.6 °F | 2.34 in. |
| February | 21.8 °F | 37.7 °F | 1.43 in. |
| March | 28.1 °F | 49.0 °F | 1.57 in. |
| April | 33.9 °F | 59.7 °F | 1.53 in. |
| May | 41.9 °F | 69.2 °F | 2.31 in. |
| June | 47.9 °F | 75.0 °F | 2.75 in. |
| July | 52.1 °F | 84.5 °F | 1.22 in. |
| August | 51.1 °F | 85.4 °F | 0.86 in. |
| September | 43.9 °F | 75.1 °F | 0.92 in. |
| October | 34.6 °F | 57.5 °F | 1.7 in. |
| November | 27.6 °F | 41.1 °F | 1.93 in. |
| December | 20.8 °F | 31.4 °F | 2.41 in. |
| Annual | 35.3 °F | 58 °F | 20.97 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |