Old Forge, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.8 °C (low) to 11.3 °C (high). Annual precipitation averages 1301.7 Millimeters. Old Forge is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.2 °C | -3.2 °C | 109.73 mm |
| February | -14.7 °C | -1.7 °C | 84.07 mm |
| March | -9.9 °C | 2.9 °C | 83.82 mm |
| April | -2.1 °C | 10.3 °C | 98.04 mm |
| May | 4.7 °C | 18 °C | 112.27 mm |
| June | 9.9 °C | 22.2 °C | 121.41 mm |
| July | 12.2 °C | 24.4 °C | 107.44 mm |
| August | 11.4 °C | 23.9 °C | 113.03 mm |
| September | 7.4 °C | 20.2 °C | 107.44 mm |
| October | 1.4 °C | 12.8 °C | 138.43 mm |
| November | -4.1 °C | 5.7 °C | 112.52 mm |
| December | -10.4 °C | -0.5 °C | 113.54 mm |
| Annual | -0.8 °C | 11.3 °C | 1301.74 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |