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New Castle County, DE (shown in white) has 426.34 mi² of land area and 67.69 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 0' to a high of 400.3', with a weighted average of 77.8' above sea level.
Temperatures range from average lows around 25.3°F to average highs around 87.3°F. A year-round daily temperature averages 55.8°F. Average annual precipation is 49.4". With these temperatures and precipation, the majority of the county scores as an 7A using the USDA Plant Hardiness Zone Map (the standard by which gardeners and growers can determine which perennial plants are most likely to thrive in a location).
The estimated population of New Castle County is 585,415 with 224,954 households. These households are spread across 26 unique municipalties (not all shown).
