Mount Lebanon, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.6 °C (low) to 24.5 °C (high). Annual precipitation averages 1465.6 Millimeters. Mount Lebanon is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.4 °C | 13.8 °C | 138.68 mm |
| February | 3 °C | 16.1 °C | 133.1 mm |
| March | 6.7 °C | 20.4 °C | 140.21 mm |
| April | 10.7 °C | 24.4 °C | 144.53 mm |
| May | 16 °C | 28.5 °C | 122.17 mm |
| June | 20.2 °C | 32.2 °C | 119.13 mm |
| July | 21.9 °C | 33.9 °C | 97.03 mm |
| August | 21.4 °C | 34 °C | 87.63 mm |
| September | 17.8 °C | 31.3 °C | 96.01 mm |
| October | 11.3 °C | 25.8 °C | 121.41 mm |
| November | 5.8 °C | 19.3 °C | 118.87 mm |
| December | 2.4 °C | 14.8 °C | 146.81 mm |
| Annual | 11.6 °C | 24.5 °C | 1465.58 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |