Danville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.9 °F (low) to 61.3 °F (high). Annual precipitation averages 44.1 Inches. Danville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.7 °F | 35.8 °F | 3.29 in. |
| February | 21.0 °F | 38.8 °F | 2.42 in. |
| March | 28.3 °F | 48.2 °F | 3.51 in. |
| April | 38.3 °F | 61.7 °F | 3.97 in. |
| May | 48.9 °F | 72.1 °F | 3.84 in. |
| June | 58.2 °F | 80.2 °F | 4.22 in. |
| July | 62.3 °F | 84.6 °F | 4.14 in. |
| August | 60.7 °F | 82.7 °F | 4.01 in. |
| September | 53.3 °F | 76.1 °F | 4.37 in. |
| October | 42.1 °F | 63.6 °F | 3.95 in. |
| November | 32.5 °F | 51.5 °F | 3.1 in. |
| December | 25.3 °F | 40.5 °F | 3.24 in. |
| Annual | 40.9 °F | 61.3 °F | 44.06 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |