Lynch, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.6 °C (low) to 18.7 °C (high). Annual precipitation averages 1402.3 Millimeters. Lynch is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.2 °C | 6.7 °C | 109.98 mm |
| February | -2.6 °C | 8.9 °C | 115.82 mm |
| March | 0.9 °C | 13.7 °C | 131.83 mm |
| April | 5.9 °C | 19.4 °C | 128.78 mm |
| May | 10.8 °C | 23.5 °C | 121.92 mm |
| June | 14.9 °C | 27.5 °C | 118.87 mm |
| July | 17.2 °C | 28.8 °C | 150.88 mm |
| August | 16.8 °C | 28.1 °C | 114.55 mm |
| September | 13.3 °C | 26 °C | 104.14 mm |
| October | 6.8 °C | 19.7 °C | 78.49 mm |
| November | 1.1 °C | 13.8 °C | 94.74 mm |
| December | -1.8 °C | 8.7 °C | 132.33 mm |
| Annual | 6.6 °C | 18.7 °C | 1402.33 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |