Lebanon, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 21 °C (high). Annual precipitation averages 1400.8 Millimeters. Lebanon is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.4 °C | 8.3 °C | 111.51 mm |
| February | -1.1 °C | 10.9 °C | 122.68 mm |
| March | 2.8 °C | 15.8 °C | 129.03 mm |
| April | 7.6 °C | 21.4 °C | 125.48 mm |
| May | 13.1 °C | 26 °C | 130.3 mm |
| June | 17.9 °C | 30 °C | 122.43 mm |
| July | 20.1 °C | 31.8 °C | 134.11 mm |
| August | 19.3 °C | 31.6 °C | 100.08 mm |
| September | 15.3 °C | 28.4 °C | 105.92 mm |
| October | 8.2 °C | 22.3 °C | 91.95 mm |
| November | 2.3 °C | 15.4 °C | 98.04 mm |
| December | -0.7 °C | 10.2 °C | 129.29 mm |
| Annual | 8.5 °C | 21 °C | 1400.82 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |