Penndel, Pennsylvania has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.7 °C (low) to 18.1 °C (high). Annual precipitation averages 1232.7 Millimeters. 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 | -4 °C | 4.9 °C | 89.92 mm |
| February | -3.3 °C | 6.4 °C | 71.37 mm |
| March | 0.6 °C | 10.8 °C | 112.78 mm |
| April | 6.1 °C | 17.6 °C | 92.2 mm |
| May | 11.6 °C | 22.9 °C | 106.17 mm |
| June | 16.9 °C | 27.9 °C | 109.47 mm |
| July | 19.9 °C | 30.5 °C | 121.92 mm |
| August | 18.9 °C | 29.6 °C | 126.24 mm |
| September | 15 °C | 26 °C | 105.66 mm |
| October | 8.5 °C | 19.3 °C | 101.6 mm |
| November | 2.9 °C | 13.2 °C | 83.06 mm |
| December | -1.2 °C | 7.6 °C | 112.27 mm |
| Annual | 7.7 °C | 18.1 °C | 1232.66 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |