West Farmington, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.1 °F (low) to 60.1 °F (high). Annual precipitation averages 42.6 Inches. West Farmington 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 | 18.1 °F | 34.5 °F | 3.06 in. |
| February | 18.8 °F | 37.3 °F | 2.36 in. |
| March | 26.3 °F | 46.5 °F | 3.22 in. |
| April | 36.4 °F | 60.1 °F | 3.89 in. |
| May | 46.7 °F | 71.0 °F | 4.02 in. |
| June | 55.8 °F | 79.2 °F | 4.25 in. |
| July | 59.9 °F | 83.1 °F | 4.43 in. |
| August | 58.0 °F | 81.6 °F | 3.57 in. |
| September | 51.7 °F | 75.2 °F | 3.98 in. |
| October | 40.8 °F | 62.9 °F | 3.53 in. |
| November | 32.3 °F | 50.2 °F | 3.12 in. |
| December | 24.7 °F | 39.3 °F | 3.14 in. |
| Annual | 39.1 °F | 60.1 °F | 42.57 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 |