Wilmington, Delaware has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 46.2 °F (low) to 63.5 °F (high). Annual precipitation averages 47.8 Inches. Wilmington 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.1 °F | 40.3 °F | 3.53 in. |
| February | 26.2 °F | 42.7 °F | 2.91 in. |
| March | 33.3 °F | 50.6 °F | 4.38 in. |
| April | 43.9 °F | 62.6 °F | 3.84 in. |
| May | 53.5 °F | 72.0 °F | 3.81 in. |
| June | 62.8 °F | 81.1 °F | 4.63 in. |
| July | 68.3 °F | 85.6 °F | 4.82 in. |
| August | 66.6 °F | 83.8 °F | 4.34 in. |
| September | 59.6 °F | 77.6 °F | 4.37 in. |
| October | 47.5 °F | 65.8 °F | 3.84 in. |
| November | 37.3 °F | 54.9 °F | 3.09 in. |
| December | 30.2 °F | 45.1 °F | 4.26 in. |
| Annual | 46.2 °F | 63.5 °F | 47.82 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |