West Farmington, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4 °C (low) to 15.6 °C (high). Annual precipitation averages 1081.3 Millimeters. 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 | -7.7 °C | 1.4 °C | 77.72 mm |
| February | -7.3 °C | 2.9 °C | 59.94 mm |
| March | -3.2 °C | 8.1 °C | 81.79 mm |
| April | 2.4 °C | 15.6 °C | 98.81 mm |
| May | 8.2 °C | 21.7 °C | 102.11 mm |
| June | 13.2 °C | 26.2 °C | 107.95 mm |
| July | 15.5 °C | 28.4 °C | 112.52 mm |
| August | 14.4 °C | 27.6 °C | 90.68 mm |
| September | 10.9 °C | 24 °C | 101.09 mm |
| October | 4.9 °C | 17.2 °C | 89.66 mm |
| November | 0.2 °C | 10.1 °C | 79.25 mm |
| December | -4.1 °C | 4.1 °C | 79.76 mm |
| Annual | 4 °C | 15.6 °C | 1081.28 mm |
| 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 : -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 |