Lebanon, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.4 °C (low) to 19.3 °C (high). Annual precipitation averages 1317.5 Millimeters. Lebanon 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 | -4 °C | 6.1 °C | 98.04 mm |
| February | -2.3 °C | 8.6 °C | 99.06 mm |
| March | 1.2 °C | 13.5 °C | 125.98 mm |
| April | 6.7 °C | 19.4 °C | 120.65 mm |
| May | 12.3 °C | 24.3 °C | 136.65 mm |
| June | 16.8 °C | 28.8 °C | 134.62 mm |
| July | 18.8 °C | 30.4 °C | 120.14 mm |
| August | 17.8 °C | 30.1 °C | 91.19 mm |
| September | 13.8 °C | 27.1 °C | 100.08 mm |
| October | 7.6 °C | 21.1 °C | 87.88 mm |
| November | 1.6 °C | 13.7 °C | 87.88 mm |
| December | -1.9 °C | 8.1 °C | 115.32 mm |
| Annual | 7.4 °C | 19.3 °C | 1317.49 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 |