Greenville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.9 °C (low) to 15.5 °C (high). Annual precipitation averages 1094.5 Millimeters. Greenville is located in USDA Plant Hardiness Zone 6a. 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 | -7.7 °C | 1.4 °C | 74.93 mm |
| February | -7.5 °C | 2.8 °C | 55.63 mm |
| March | -3.3 °C | 7.9 °C | 76.2 mm |
| April | 2.3 °C | 15.6 °C | 102.62 mm |
| May | 8.2 °C | 21.7 °C | 101.09 mm |
| June | 13.2 °C | 26.2 °C | 116.84 mm |
| July | 15.5 °C | 28.2 °C | 113.79 mm |
| August | 14.4 °C | 27.3 °C | 98.81 mm |
| September | 10.8 °C | 23.9 °C | 107.44 mm |
| October | 4.9 °C | 17.2 °C | 89.41 mm |
| November | 0.1 °C | 10.1 °C | 78.49 mm |
| December | -4.2 °C | 4.1 °C | 79.25 mm |
| Annual | 3.9 °C | 15.5 °C | 1094.5 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |