Seabrook, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.3 °C (low) to 24.8 °C (high). Annual precipitation averages 1324.1 Millimeters. Seabrook is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.4 °C | 15.7 °C | 96.27 mm |
| February | 4.9 °C | 17.4 °C | 89.92 mm |
| March | 8.3 °C | 21 °C | 86.61 mm |
| April | 12.4 °C | 24.9 °C | 86.87 mm |
| May | 17 °C | 28.8 °C | 80.77 mm |
| June | 20.9 °C | 31.6 °C | 146.56 mm |
| July | 22.8 °C | 33.1 °C | 157.48 mm |
| August | 22.4 °C | 32.2 °C | 173.74 mm |
| September | 19.9 °C | 29.8 °C | 137.16 mm |
| October | 14.1 °C | 25.7 °C | 98.04 mm |
| November | 8.2 °C | 20.7 °C | 74.93 mm |
| December | 5.2 °C | 17.1 °C | 95.76 mm |
| Annual | 13.3 °C | 24.8 °C | 1324.11 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |