Pennington, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.7 °F (low) to 63.3 °F (high). Annual precipitation averages 48.8 Inches. Pennington 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.8 °F | 39.6 °F | 3.57 in. |
| February | 24.1 °F | 42.3 °F | 2.84 in. |
| March | 31.2 °F | 50.3 °F | 4.23 in. |
| April | 41.2 °F | 62.3 °F | 3.75 in. |
| May | 51.2 °F | 71.9 °F | 4.16 in. |
| June | 60.2 °F | 81.0 °F | 4.54 in. |
| July | 65.5 °F | 85.8 °F | 5.04 in. |
| August | 63.8 °F | 83.9 °F | 4.52 in. |
| September | 56.6 °F | 77.5 °F | 4.13 in. |
| October | 44.9 °F | 65.4 °F | 4.08 in. |
| November | 34.9 °F | 54.8 °F | 3.44 in. |
| December | 27.7 °F | 44.6 °F | 4.45 in. |
| Annual | 43.7 °F | 63.3 °F | 48.75 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |