Muncy, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.1 °C (low) to 16.3 °C (high). Annual precipitation averages 1125 Millimeters. Muncy 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 | -6.8 °C | 2.1 °C | 83.06 mm |
| February | -6.1 °C | 3.8 °C | 62.99 mm |
| March | -2 °C | 9.1 °C | 88.14 mm |
| April | 3.7 °C | 16.4 °C | 98.04 mm |
| May | 9.6 °C | 22.4 °C | 99.82 mm |
| June | 14.7 °C | 26.9 °C | 102.62 mm |
| July | 17 °C | 29.4 °C | 114.05 mm |
| August | 16.2 °C | 28.3 °C | 98.3 mm |
| September | 12.1 °C | 24.5 °C | 109.98 mm |
| October | 5.8 °C | 17.6 °C | 96.52 mm |
| November | 0.4 °C | 10.8 °C | 80.52 mm |
| December | -3.6 °C | 4.7 °C | 90.93 mm |
| Annual | 5.1 °C | 16.3 °C | 1124.97 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Dfb - Humid Continental Mild Summer, Wet All Year |