Lebanon, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.7 °C (low) to 19.2 °C (high). Annual precipitation averages 1152.7 Millimeters. Lebanon is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 5.6 °C | 68.58 mm |
| February | -2.6 °C | 8.5 °C | 67.56 mm |
| March | 1.8 °C | 13.7 °C | 93.47 mm |
| April | 7.2 °C | 19.7 °C | 117.6 mm |
| May | 12.6 °C | 24.3 °C | 135.38 mm |
| June | 17.3 °C | 28.6 °C | 112.78 mm |
| July | 19.7 °C | 31.1 °C | 102.62 mm |
| August | 18.7 °C | 30.8 °C | 99.82 mm |
| September | 14.1 °C | 26.6 °C | 111 mm |
| October | 7.9 °C | 20.4 °C | 84.33 mm |
| November | 2.3 °C | 13.2 °C | 92.96 mm |
| December | -2.3 °C | 7.4 °C | 66.55 mm |
| Annual | 7.7 °C | 19.2 °C | 1152.65 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |