Mount Aetna, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.7 °F (low) to 62.3 °F (high). Annual precipitation averages 48.1 Inches. Mount Aetna is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.4 °F | 37.5 °F | 3.39 in. |
| February | 21.6 °F | 40.6 °F | 2.71 in. |
| March | 29.3 °F | 49.4 °F | 4.09 in. |
| April | 39.5 °F | 62.1 °F | 4.03 in. |
| May | 49.5 °F | 71.8 °F | 3.82 in. |
| June | 58.8 °F | 80.5 °F | 4.91 in. |
| July | 63.3 °F | 85.2 °F | 4.42 in. |
| August | 61.5 °F | 83.4 °F | 4.23 in. |
| September | 54.4 °F | 76.6 °F | 4.74 in. |
| October | 42.7 °F | 64.9 °F | 4.33 in. |
| November | 33.1 °F | 53.0 °F | 3.37 in. |
| December | 25.9 °F | 42.2 °F | 4.05 in. |
| Annual | 41.7 °F | 62.3 °F | 48.09 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |