Georgetown, Delaware has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.7 °C (low) to 18.9 °C (high). Annual precipitation averages 1191.3 Millimeters. Georgetown is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 6.7 °C | 88.14 mm |
| February | -2.9 °C | 8.3 °C | 77.72 mm |
| March | 0.7 °C | 12.1 °C | 108.97 mm |
| April | 6.3 °C | 18.1 °C | 90.42 mm |
| May | 11.8 °C | 23 °C | 94.23 mm |
| June | 17.1 °C | 27.8 °C | 106.17 mm |
| July | 19.7 °C | 30.5 °C | 104.9 mm |
| August | 18.5 °C | 29.4 °C | 118.36 mm |
| September | 15.2 °C | 26.2 °C | 110.24 mm |
| October | 8.7 °C | 20.3 °C | 105.41 mm |
| November | 2.4 °C | 14.5 °C | 86.36 mm |
| December | -1.2 °C | 9.4 °C | 100.33 mm |
| Annual | 7.7 °C | 18.9 °C | 1191.25 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |