Alleghenyville, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.2 °C (low) to 16.7 °C (high). Annual precipitation averages 1246.6 Millimeters. Alleghenyville 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 | -5.4 °C | 3.5 °C | 85.09 mm |
| February | -4.9 °C | 4.8 °C | 69.85 mm |
| March | -0.8 °C | 9.6 °C | 103.89 mm |
| April | 4.8 °C | 16.4 °C | 97.03 mm |
| May | 10.3 °C | 21.8 °C | 99.31 mm |
| June | 15.4 °C | 26.6 °C | 119.38 mm |
| July | 18.3 °C | 28.9 °C | 122.94 mm |
| August | 17.3 °C | 28 °C | 112.27 mm |
| September | 13.4 °C | 24.6 °C | 132.08 mm |
| October | 7 °C | 17.9 °C | 117.6 mm |
| November | 1.8 °C | 11.8 °C | 87.63 mm |
| December | -2.4 °C | 6.1 °C | 99.57 mm |
| Annual | 6.2 °C | 16.7 °C | 1246.64 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |