Swedesboro, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.2 °F (low) to 64 °F (high). Annual precipitation averages 46.6 Inches. Swedesboro is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.2 °F | 40.9 °F | 3.61 in. |
| February | 27.5 °F | 43.1 °F | 2.95 in. |
| March | 34.0 °F | 50.8 °F | 4.37 in. |
| April | 44.5 °F | 62.9 °F | 3.57 in. |
| May | 54.2 °F | 72.5 °F | 3.69 in. |
| June | 63.7 °F | 81.9 °F | 4.33 in. |
| July | 69.2 °F | 86.0 °F | 4.66 in. |
| August | 67.6 °F | 84.3 °F | 4.48 in. |
| September | 60.8 °F | 78.1 °F | 4.05 in. |
| October | 48.6 °F | 66.3 °F | 3.84 in. |
| November | 38.5 °F | 55.5 °F | 2.99 in. |
| December | 31.3 °F | 45.9 °F | 4.1 in. |
| Annual | 47.2 °F | 64 °F | 46.64 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |