Summersville, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8 °C (low) to 19.5 °C (high). Annual precipitation averages 1375.9 Millimeters. Summersville is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.4 °C | 6.5 °C | 103.38 mm |
| February | -1.8 °C | 9.1 °C | 108.46 mm |
| March | 1.9 °C | 14 °C | 130.56 mm |
| April | 7.3 °C | 19.8 °C | 122.94 mm |
| May | 12.9 °C | 24.4 °C | 141.99 mm |
| June | 17.3 °C | 29 °C | 127.76 mm |
| July | 19.3 °C | 30.5 °C | 131.57 mm |
| August | 18.3 °C | 30 °C | 99.31 mm |
| September | 14.5 °C | 27.1 °C | 104.39 mm |
| October | 8.1 °C | 21.3 °C | 90.42 mm |
| November | 2.2 °C | 14.1 °C | 94.74 mm |
| December | -1.1 °C | 8.5 °C | 120.4 mm |
| Annual | 8 °C | 19.5 °C | 1375.92 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |