Sea Isle City, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 17 °C (high). Annual precipitation averages 1176 Millimeters. Sea Isle City 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.6 °C | 5.7 °C | 86.11 mm |
| February | -2 °C | 6.3 °C | 77.22 mm |
| March | 1.6 °C | 9.8 °C | 115.06 mm |
| April | 7.2 °C | 14.4 °C | 90.42 mm |
| May | 12.1 °C | 19.6 °C | 87.88 mm |
| June | 17.6 °C | 24.8 °C | 93.47 mm |
| July | 20.7 °C | 28.8 °C | 112.78 mm |
| August | 20 °C | 28 °C | 111.76 mm |
| September | 16.7 °C | 24.9 °C | 94.74 mm |
| October | 10.3 °C | 19.3 °C | 110.24 mm |
| November | 4.6 °C | 13.3 °C | 86.36 mm |
| December | 0.3 °C | 8.7 °C | 109.98 mm |
| Annual | 8.9 °C | 17 °C | 1176.02 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |