Greenville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 16 °C (high). Annual precipitation averages 1028.2 Millimeters. Greenville is located in USDA Plant Hardiness Zone 6a. 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 | -7.7 °C | 1 °C | 71.88 mm |
| February | -6.3 °C | 3.2 °C | 56.9 mm |
| March | -1.6 °C | 9 °C | 81.28 mm |
| April | 4.2 °C | 16.3 °C | 105.41 mm |
| May | 10.4 °C | 22.1 °C | 111 mm |
| June | 15.7 °C | 26.8 °C | 113.03 mm |
| July | 17 °C | 28.3 °C | 103.12 mm |
| August | 15.8 °C | 27.8 °C | 86.11 mm |
| September | 11.7 °C | 24.9 °C | 72.64 mm |
| October | 5.6 °C | 18.1 °C | 73.41 mm |
| November | 0.1 °C | 10.2 °C | 78.99 mm |
| December | -4.4 °C | 3.7 °C | 74.42 mm |
| Annual | 5 °C | 16 °C | 1028.19 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |