Old Forge, 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 15.7 °C (high). Annual precipitation averages 1021.6 Millimeters. Old Forge 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 | -7.4 °C | 1.4 °C | 62.74 mm |
| February | -6.8 °C | 2.9 °C | 51.56 mm |
| March | -2.7 °C | 7.8 °C | 69.09 mm |
| April | 3.3 °C | 15.5 °C | 88.65 mm |
| May | 9.1 °C | 21.8 °C | 82.8 mm |
| June | 13.9 °C | 26.3 °C | 115.32 mm |
| July | 16.3 °C | 28.9 °C | 113.03 mm |
| August | 15.4 °C | 27.8 °C | 109.47 mm |
| September | 11.5 °C | 24 °C | 98.55 mm |
| October | 5.4 °C | 17 °C | 95.76 mm |
| November | 0.4 °C | 10.4 °C | 64.77 mm |
| December | -3.8 °C | 4.4 °C | 69.85 mm |
| Annual | 4.6 °C | 15.7 °C | 1021.59 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |