Milton, Delaware has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.4 °F (low) to 65.9 °F (high). Annual precipitation averages 47 Inches. Milton 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 | 25.8 °F | 44.0 °F | 3.45 in. |
| February | 27.3 °F | 46.7 °F | 3.08 in. |
| March | 33.8 °F | 53.4 °F | 4.25 in. |
| April | 43.8 °F | 64.6 °F | 3.51 in. |
| May | 53.6 °F | 73.5 °F | 3.7 in. |
| June | 63.2 °F | 82.3 °F | 4.04 in. |
| July | 67.9 °F | 86.8 °F | 4.34 in. |
| August | 65.9 °F | 84.8 °F | 4.61 in. |
| September | 59.9 °F | 79.1 °F | 4.31 in. |
| October | 47.9 °F | 68.5 °F | 4.23 in. |
| November | 37.4 °F | 57.9 °F | 3.37 in. |
| December | 30.5 °F | 49.0 °F | 4.07 in. |
| Annual | 46.4 °F | 65.9 °F | 46.96 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 7b : 5°F to 10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |