New Lebanon, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.7 °F (low) to 57.9 °F (high). Annual precipitation averages 46 Inches. New Lebanon is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.1 °F | 32.8 °F | 3.35 in. |
| February | 17.9 °F | 35.6 °F | 2.53 in. |
| March | 25.2 °F | 44.6 °F | 3.33 in. |
| April | 36.2 °F | 57.7 °F | 4.11 in. |
| May | 46.9 °F | 68.7 °F | 4.02 in. |
| June | 55.6 °F | 76.6 °F | 4.93 in. |
| July | 59.6 °F | 80.5 °F | 4.91 in. |
| August | 58.0 °F | 79.1 °F | 4.04 in. |
| September | 51.4 °F | 72.7 °F | 4.16 in. |
| October | 41.0 °F | 60.5 °F | 3.7 in. |
| November | 31.7 °F | 48.3 °F | 3.4 in. |
| December | 23.4 °F | 37.5 °F | 3.48 in. |
| Annual | 38.7 °F | 57.9 °F | 45.96 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |