Farmington, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.1 °C (low) to 20.1 °C (high). Annual precipitation averages 1362.7 Millimeters. Farmington is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.3 °C | 6.9 °C | 101.35 mm |
| February | -1 °C | 9.4 °C | 112.01 mm |
| March | 3.4 °C | 14.9 °C | 127.51 mm |
| April | 8.7 °C | 20.7 °C | 131.83 mm |
| May | 14.2 °C | 25.2 °C | 145.54 mm |
| June | 18.8 °C | 29.4 °C | 118.62 mm |
| July | 20.6 °C | 31.2 °C | 109.22 mm |
| August | 19.6 °C | 31 °C | 85.6 mm |
| September | 15.5 °C | 27.8 °C | 96.27 mm |
| October | 8.9 °C | 21.4 °C | 95.76 mm |
| November | 3.3 °C | 14.4 °C | 108.2 mm |
| December | -0.6 °C | 8.7 °C | 130.81 mm |
| Annual | 9.1 °C | 20.1 °C | 1362.72 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |