Plymptonville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 14.5 °C (high). Annual precipitation averages 1130 Millimeters. Plymptonville is located in USDA Plant Hardiness Zone 6a. 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 | -8.7 °C | 0.5 °C | 84.07 mm |
| February | -8.1 °C | 2.1 °C | 67.56 mm |
| March | -4.1 °C | 7.2 °C | 84.58 mm |
| April | 1.7 °C | 14.8 °C | 98.04 mm |
| May | 7.6 °C | 20.8 °C | 105.41 mm |
| June | 12.1 °C | 24.9 °C | 126.49 mm |
| July | 14.5 °C | 27.2 °C | 97.28 mm |
| August | 13.7 °C | 26.4 °C | 94.74 mm |
| September | 9.8 °C | 22.6 °C | 103.12 mm |
| October | 3.8 °C | 15.9 °C | 93.73 mm |
| November | -1.3 °C | 9.1 °C | 87.63 mm |
| December | -5.3 °C | 2.8 °C | 87.38 mm |
| Annual | 3 °C | 14.5 °C | 1130.03 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |