West Lebanon, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.6 °F (low) to 61.6 °F (high). Annual precipitation averages 40.3 Inches. West Lebanon is located in USDA Plant Hardiness Zone 6a. 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 | 17.6 °F | 33.4 °F | 2.41 in. |
| February | 20.5 °F | 37.8 °F | 2.07 in. |
| March | 29.9 °F | 49.4 °F | 2.77 in. |
| April | 40.4 °F | 62.5 °F | 4.06 in. |
| May | 51.9 °F | 73.5 °F | 4.52 in. |
| June | 61.2 °F | 81.6 °F | 4.93 in. |
| July | 63.8 °F | 84.2 °F | 4.29 in. |
| August | 61.5 °F | 82.8 °F | 3.42 in. |
| September | 53.9 °F | 78.3 °F | 2.95 in. |
| October | 42.7 °F | 65.9 °F | 3.21 in. |
| November | 32.5 °F | 50.7 °F | 3.2 in. |
| December | 23.4 °F | 38.5 °F | 2.46 in. |
| Annual | 41.6 °F | 61.6 °F | 40.29 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |