Mount Aetna, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 16.8 °C (high). Annual precipitation averages 1221.5 Millimeters. 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 | -6.4 °C | 3.1 °C | 86.11 mm |
| February | -5.8 °C | 4.8 °C | 68.83 mm |
| March | -1.5 °C | 9.7 °C | 103.89 mm |
| April | 4.2 °C | 16.7 °C | 102.36 mm |
| May | 9.7 °C | 22.1 °C | 97.03 mm |
| June | 14.9 °C | 26.9 °C | 124.71 mm |
| July | 17.4 °C | 29.6 °C | 112.27 mm |
| August | 16.4 °C | 28.6 °C | 107.44 mm |
| September | 12.4 °C | 24.8 °C | 120.4 mm |
| October | 5.9 °C | 18.3 °C | 109.98 mm |
| November | 0.6 °C | 11.7 °C | 85.6 mm |
| December | -3.4 °C | 5.7 °C | 102.87 mm |
| Annual | 5.4 °C | 16.8 °C | 1221.49 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |