Washingtonville, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4 °C (low) to 15.9 °C (high). Annual precipitation averages 1028.4 Millimeters. Washingtonville 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 | -7.7 °C | 1.6 °C | 73.66 mm |
| February | -7.2 °C | 3.2 °C | 57.4 mm |
| March | -3 °C | 8.5 °C | 78.74 mm |
| April | 2.8 °C | 16.1 °C | 101.35 mm |
| May | 8.2 °C | 21.8 °C | 93.98 mm |
| June | 13.4 °C | 26.4 °C | 108.46 mm |
| July | 15.6 °C | 28.5 °C | 110.74 mm |
| August | 14.4 °C | 27.8 °C | 80.26 mm |
| September | 10.7 °C | 24.4 °C | 96.77 mm |
| October | 4.7 °C | 17.5 °C | 81.03 mm |
| November | -0.1 °C | 10.3 °C | 72.9 mm |
| December | -4.3 °C | 4.3 °C | 73.15 mm |
| Annual | 4 °C | 15.9 °C | 1028.44 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 |