Silkworth, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.2 °F (low) to 58.5 °F (high). Annual precipitation averages 46.7 Inches. Silkworth 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.2 °F | 33.4 °F | 3.48 in. |
| February | 17.7 °F | 35.9 °F | 2.53 in. |
| March | 25.1 °F | 44.4 °F | 3.27 in. |
| April | 35.9 °F | 57.9 °F | 4.1 in. |
| May | 46.2 °F | 69.1 °F | 3.86 in. |
| June | 55.2 °F | 77.1 °F | 4.98 in. |
| July | 59.5 °F | 82.1 °F | 4.21 in. |
| August | 57.7 °F | 80.0 °F | 4.31 in. |
| September | 50.7 °F | 73.3 °F | 4.75 in. |
| October | 39.9 °F | 60.8 °F | 4.52 in. |
| November | 31.0 °F | 49.1 °F | 3.11 in. |
| December | 22.9 °F | 38.4 °F | 3.59 in. |
| Annual | 38.2 °F | 58.5 °F | 46.71 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |