Pen Argyl, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 15.8 °C (high). Annual precipitation averages 1362.7 Millimeters. Pen Argyl is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.1 °C | 2.3 °C | 100.08 mm |
| February | -6.6 °C | 3.9 °C | 77.22 mm |
| March | -2.5 °C | 8.4 °C | 100.84 mm |
| April | 3.2 °C | 15.7 °C | 109.47 mm |
| May | 8.9 °C | 21.3 °C | 109.98 mm |
| June | 13.9 °C | 25.8 °C | 133.1 mm |
| July | 16.7 °C | 28.5 °C | 126.24 mm |
| August | 15.7 °C | 27.4 °C | 126.24 mm |
| September | 11.7 °C | 23.8 °C | 139.7 mm |
| October | 5.6 °C | 17.2 °C | 130.56 mm |
| November | 0.1 °C | 10.7 °C | 94.74 mm |
| December | -4.1 °C | 5.1 °C | 114.55 mm |
| Annual | 4.6 °C | 15.8 °C | 1362.72 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |