Caswell Beach, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.6 °C (low) to 22 °C (high). Annual precipitation averages 1494.6 Millimeters. Caswell Beach is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.4 °C | 12.5 °C | 97.54 mm |
| February | 4.3 °C | 13.8 °C | 89.92 mm |
| March | 7.7 °C | 17.1 °C | 99.82 mm |
| April | 12.7 °C | 21.7 °C | 87.38 mm |
| May | 17.6 °C | 25.6 °C | 105.92 mm |
| June | 21.8 °C | 29.1 °C | 129.29 mm |
| July | 23.8 °C | 29.6 °C | 171.96 mm |
| August | 23.1 °C | 30.2 °C | 179.32 mm |
| September | 20.4 °C | 27.5 °C | 219.71 mm |
| October | 14.6 °C | 23.3 °C | 124.46 mm |
| November | 8.9 °C | 18.4 °C | 93.47 mm |
| December | 5.3 °C | 14.6 °C | 95.76 mm |
| Annual | 13.6 °C | 22 °C | 1494.55 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |