Penndel, Pennsylvania has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.8 °F (low) to 64.5 °F (high). Annual precipitation averages 48.5 Inches. Penndel is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.8 °F | 40.9 °F | 3.54 in. |
| February | 26.0 °F | 43.6 °F | 2.81 in. |
| March | 33.0 °F | 51.5 °F | 4.44 in. |
| April | 43.0 °F | 63.7 °F | 3.63 in. |
| May | 52.8 °F | 73.2 °F | 4.18 in. |
| June | 62.4 °F | 82.2 °F | 4.31 in. |
| July | 67.8 °F | 86.9 °F | 4.8 in. |
| August | 66.1 °F | 85.3 °F | 4.97 in. |
| September | 59.0 °F | 78.8 °F | 4.16 in. |
| October | 47.3 °F | 66.8 °F | 4.0 in. |
| November | 37.2 °F | 55.7 °F | 3.27 in. |
| December | 29.9 °F | 45.6 °F | 4.42 in. |
| Annual | 45.8 °F | 64.5 °F | 48.53 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |