Succasunna, New Jersey has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.4 °C (low) to 15.9 °C (high). Annual precipitation averages 1290.1 Millimeters. Succasunna 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.4 °C | 95 mm |
| February | -6.1 °C | 3.7 °C | 79.76 mm |
| March | -2 °C | 8.3 °C | 108.2 mm |
| April | 4.2 °C | 15.6 °C | 99.82 mm |
| May | 9.6 °C | 21.2 °C | 101.6 mm |
| June | 15.1 °C | 26 °C | 131.83 mm |
| July | 17.6 °C | 28.9 °C | 112.78 mm |
| August | 16.9 °C | 27.8 °C | 119.89 mm |
| September | 12.6 °C | 23.9 °C | 122.17 mm |
| October | 6.2 °C | 17.3 °C | 112.52 mm |
| November | 0.9 °C | 10.9 °C | 90.17 mm |
| December | -3.1 °C | 5.2 °C | 116.33 mm |
| Annual | 5.4 °C | 15.9 °C | 1290.07 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |