Penn Lake Park, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 14.4 °C (high). Annual precipitation averages 1249.4 Millimeters. Penn Lake Park 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 | -9 °C | 0.5 °C | 86.87 mm |
| February | -8.2 °C | 2.1 °C | 66.8 mm |
| March | -4.2 °C | 6.6 °C | 86.11 mm |
| April | 1.7 °C | 14.3 °C | 100.84 mm |
| May | 7.6 °C | 20.4 °C | 108.2 mm |
| June | 12.4 °C | 24.8 °C | 130.05 mm |
| July | 14.8 °C | 27.2 °C | 117.35 mm |
| August | 13.9 °C | 26.2 °C | 116.33 mm |
| September | 10.1 °C | 22.3 °C | 130.56 mm |
| October | 3.9 °C | 15.8 °C | 121.67 mm |
| November | -1.1 °C | 9.2 °C | 89.15 mm |
| December | -5.4 °C | 3.1 °C | 95.5 mm |
| Annual | 3 °C | 14.4 °C | 1249.43 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |