South Dennis, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46 °F (low) to 64.1 °F (high). Annual precipitation averages 47 Inches. South Dennis 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 | 25.1 °F | 42.4 °F | 3.33 in. |
| February | 26.2 °F | 44.2 °F | 3.09 in. |
| March | 33.2 °F | 50.9 °F | 4.54 in. |
| April | 43.2 °F | 62.2 °F | 3.62 in. |
| May | 52.6 °F | 71.3 °F | 3.5 in. |
| June | 62.1 °F | 80.5 °F | 3.73 in. |
| July | 67.7 °F | 85.1 °F | 4.59 in. |
| August | 65.9 °F | 83.6 °F | 4.67 in. |
| September | 59.5 °F | 78.0 °F | 4.02 in. |
| October | 48.2 °F | 67.4 °F | 4.34 in. |
| November | 37.6 °F | 56.5 °F | 3.39 in. |
| December | 30.1 °F | 47.4 °F | 4.21 in. |
| Annual | 46 °F | 64.1 °F | 47.03 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |