West Unity, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.6 °F (low) to 59.7 °F (high). Annual precipitation averages 36.7 Inches. West Unity 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 | 16.9 °F | 32.1 °F | 2.41 in. |
| February | 18.4 °F | 35.4 °F | 2.04 in. |
| March | 26.7 °F | 45.9 °F | 2.43 in. |
| April | 36.9 °F | 59.5 °F | 3.41 in. |
| May | 48.7 °F | 71.0 °F | 4.17 in. |
| June | 58.6 °F | 80.6 °F | 3.77 in. |
| July | 61.8 °F | 84.4 °F | 3.55 in. |
| August | 59.7 °F | 82.3 °F | 3.71 in. |
| September | 52.0 °F | 76.2 °F | 3.07 in. |
| October | 41.0 °F | 63.1 °F | 2.78 in. |
| November | 31.1 °F | 48.8 °F | 2.96 in. |
| December | 22.8 °F | 36.9 °F | 2.35 in. |
| Annual | 39.6 °F | 59.7 °F | 36.65 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |