Delaware City, Delaware has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.3 °F (low) to 64.1 °F (high). Annual precipitation averages 46 Inches. Delaware City 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 | 25.2 °F | 41.1 °F | 3.34 in. |
| February | 26.3 °F | 43.5 °F | 2.86 in. |
| March | 33.4 °F | 51.5 °F | 4.16 in. |
| April | 43.7 °F | 63.3 °F | 3.59 in. |
| May | 53.6 °F | 72.8 °F | 3.72 in. |
| June | 63.2 °F | 81.4 °F | 4.56 in. |
| July | 68.2 °F | 85.9 °F | 4.49 in. |
| August | 66.8 °F | 84.1 °F | 4.13 in. |
| September | 60.1 °F | 78.2 °F | 4.21 in. |
| October | 47.8 °F | 66.5 °F | 3.87 in. |
| November | 37.3 °F | 55.4 °F | 3.07 in. |
| December | 30.2 °F | 45.6 °F | 3.99 in. |
| Annual | 46.3 °F | 64.1 °F | 45.99 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 | Cfa - Humid Subtropical Climate |