Lebanon, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 17.6 °C (high). Annual precipitation averages 1095.8 Millimeters. Lebanon is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.7 °C | 3.4 °C | 81.53 mm |
| February | -4.6 °C | 5.6 °C | 67.06 mm |
| March | -0.2 °C | 11.1 °C | 95.5 mm |
| April | 5.6 °C | 18 °C | 114.55 mm |
| May | 11.4 °C | 23.4 °C | 120.14 mm |
| June | 16.4 °C | 27.8 °C | 115.32 mm |
| July | 18.3 °C | 29.7 °C | 102.87 mm |
| August | 17.2 °C | 29.3 °C | 84.33 mm |
| September | 13 °C | 26.2 °C | 73.41 mm |
| October | 6.5 °C | 19.4 °C | 77.72 mm |
| November | 0.8 °C | 11.9 °C | 77.98 mm |
| December | -2.9 °C | 5.8 °C | 85.34 mm |
| Annual | 6.3 °C | 17.6 °C | 1095.75 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |