Rehoboth Beach, Delaware has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.8 °C (low) to 17.9 °C (high). Annual precipitation averages 1192.8 Millimeters. Rehoboth Beach is located in USDA Plant Hardiness Zone 8a. 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 | -1.3 °C | 6.6 °C | 87.63 mm |
| February | -0.8 °C | 7.3 °C | 80.01 mm |
| March | 2.6 °C | 10.6 °C | 106.17 mm |
| April | 7.8 °C | 16.6 °C | 87.38 mm |
| May | 12.9 °C | 21.4 °C | 90.68 mm |
| June | 18.4 °C | 26.5 °C | 95.5 mm |
| July | 21.2 °C | 29.3 °C | 118.87 mm |
| August | 20.7 °C | 28.3 °C | 115.82 mm |
| September | 17.7 °C | 25.3 °C | 104.65 mm |
| October | 11.3 °C | 19.8 °C | 113.28 mm |
| November | 5.3 °C | 13.8 °C | 87.63 mm |
| December | 1.2 °C | 9.2 °C | 105.16 mm |
| Annual | 9.8 °C | 17.9 °C | 1192.78 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°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 |