South Lebanon, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.6 °F (low) to 64.6 °F (high). Annual precipitation averages 43.9 Inches. South 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 | 22.4 °F | 39.2 °F | 3.25 in. |
| February | 24.4 °F | 43.1 °F | 2.73 in. |
| March | 32.1 °F | 53.0 °F | 3.86 in. |
| April | 42.1 °F | 65.2 °F | 4.59 in. |
| May | 52.6 °F | 74.9 °F | 4.92 in. |
| June | 61.6 °F | 82.8 °F | 4.47 in. |
| July | 65.1 °F | 86.3 °F | 4.12 in. |
| August | 63.3 °F | 85.5 °F | 3.55 in. |
| September | 55.2 °F | 79.8 °F | 2.84 in. |
| October | 43.5 °F | 67.7 °F | 3.08 in. |
| November | 33.3 °F | 54.2 °F | 3.09 in. |
| December | 27.3 °F | 43.4 °F | 3.41 in. |
| Annual | 43.6 °F | 64.6 °F | 43.91 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |