Dennisville, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.7 °C (low) to 17.9 °C (high). Annual precipitation averages 1199.1 Millimeters. Dennisville is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.8 °C | 5.8 °C | 84.58 mm |
| February | -3.3 °C | 6.8 °C | 78.74 mm |
| March | 0.6 °C | 10.6 °C | 115.32 mm |
| April | 6.1 °C | 16.9 °C | 92.2 mm |
| May | 11.4 °C | 21.9 °C | 88.65 mm |
| June | 16.7 °C | 27.1 °C | 95 mm |
| July | 19.8 °C | 29.6 °C | 117.35 mm |
| August | 18.8 °C | 28.7 °C | 120.9 mm |
| September | 15.3 °C | 25.6 °C | 103.12 mm |
| October | 9.1 °C | 19.7 °C | 110.24 mm |
| November | 3.2 °C | 13.6 °C | 86.36 mm |
| December | -1 °C | 8.6 °C | 106.68 mm |
| Annual | 7.7 °C | 17.9 °C | 1199.14 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |