Loyalhanna, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 16.4 °C (high). Annual precipitation averages 1209.1 Millimeters. Loyalhanna is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 2.9 °C | 95.5 mm |
| February | -6.1 °C | 4.5 °C | 76.71 mm |
| March | -2.1 °C | 9.6 °C | 92.46 mm |
| April | 3.3 °C | 16.7 °C | 102.36 mm |
| May | 9.1 °C | 22.2 °C | 115.32 mm |
| June | 13.9 °C | 26.3 °C | 124.21 mm |
| July | 16.2 °C | 28.4 °C | 128.02 mm |
| August | 15.3 °C | 27.9 °C | 100.08 mm |
| September | 11.4 °C | 24.3 °C | 107.19 mm |
| October | 5.1 °C | 17.7 °C | 85.34 mm |
| November | -0.1 °C | 11.1 °C | 89.92 mm |
| December | -3.7 °C | 5.3 °C | 91.95 mm |
| Annual | 4.6 °C | 16.4 °C | 1209.06 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |