Franklin, New Jersey has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.9 °F (low) to 60.6 °F (high). Annual precipitation averages 48.2 Inches. Franklin is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.7 °F | 35.8 °F | 3.41 in. |
| February | 19.3 °F | 38.8 °F | 2.81 in. |
| March | 26.9 °F | 47.0 °F | 4.08 in. |
| April | 37.8 °F | 59.9 °F | 3.84 in. |
| May | 47.7 °F | 70.5 °F | 3.72 in. |
| June | 57.1 °F | 78.6 °F | 4.85 in. |
| July | 61.9 °F | 83.7 °F | 4.21 in. |
| August | 60.4 °F | 81.6 °F | 4.73 in. |
| September | 52.7 °F | 75.2 °F | 4.49 in. |
| October | 41.3 °F | 63.2 °F | 4.41 in. |
| November | 31.5 °F | 51.7 °F | 3.45 in. |
| December | 24.2 °F | 40.9 °F | 4.15 in. |
| Annual | 39.9 °F | 60.6 °F | 48.15 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |