Pen Argyl, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.3 °F (low) to 60.5 °F (high). Annual precipitation averages 53.7 Inches. 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 | 19.2 °F | 36.1 °F | 3.94 in. |
| February | 20.2 °F | 39.0 °F | 3.04 in. |
| March | 27.5 °F | 47.1 °F | 3.97 in. |
| April | 37.8 °F | 60.2 °F | 4.31 in. |
| May | 48.1 °F | 70.4 °F | 4.33 in. |
| June | 57.1 °F | 78.5 °F | 5.24 in. |
| July | 62.0 °F | 83.3 °F | 4.97 in. |
| August | 60.2 °F | 81.3 °F | 4.97 in. |
| September | 53.1 °F | 74.9 °F | 5.5 in. |
| October | 42.0 °F | 62.9 °F | 5.14 in. |
| November | 32.2 °F | 51.2 °F | 3.73 in. |
| December | 24.7 °F | 41.1 °F | 4.51 in. |
| Annual | 40.3 °F | 60.5 °F | 53.65 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |