Lebanon, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.5 °F (low) to 62.3 °F (high). Annual precipitation averages 50.5 Inches. Lebanon is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.3 °F | 38.2 °F | 3.66 in. |
| February | 21.5 °F | 40.9 °F | 2.87 in. |
| March | 28.8 °F | 49.3 °F | 4.28 in. |
| April | 39.1 °F | 62.0 °F | 4.16 in. |
| May | 49.1 °F | 71.6 °F | 4.35 in. |
| June | 58.1 °F | 80.2 °F | 4.71 in. |
| July | 63.2 °F | 85.0 °F | 4.98 in. |
| August | 61.6 °F | 83.1 °F | 4.57 in. |
| September | 54.2 °F | 76.4 °F | 4.53 in. |
| October | 42.9 °F | 64.5 °F | 4.37 in. |
| November | 32.8 °F | 53.6 °F | 3.47 in. |
| December | 25.9 °F | 43.1 °F | 4.58 in. |
| Annual | 41.5 °F | 62.3 °F | 50.53 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |