Penn Wynne, Pennsylvania has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.3 °F (low) to 64.2 °F (high). Annual precipitation averages 47.4 Inches. Penn Wynne is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.3 °F | 40.6 °F | 3.49 in. |
| February | 27.6 °F | 43.3 °F | 2.84 in. |
| March | 34.3 °F | 51.4 °F | 4.32 in. |
| April | 44.4 °F | 63.4 °F | 3.64 in. |
| May | 54.0 °F | 72.8 °F | 3.93 in. |
| June | 63.6 °F | 82.0 °F | 4.31 in. |
| July | 69.1 °F | 86.6 °F | 4.47 in. |
| August | 67.6 °F | 84.9 °F | 4.79 in. |
| September | 60.7 °F | 78.4 °F | 4.36 in. |
| October | 49.0 °F | 66.2 °F | 3.85 in. |
| November | 38.9 °F | 55.3 °F | 3.12 in. |
| December | 31.6 °F | 45.4 °F | 4.3 in. |
| Annual | 47.3 °F | 64.2 °F | 47.42 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |