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Nassau County, NY (shown in white) has 284.54 mi² of land area and 168.84 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 0' to a high of 315', with a weighted average of 53.7' above sea level.
Temperatures range from average lows around 25.7°F to average highs around 84.5°F. A year-round daily temperature averages 54.3°F. Average annual precipation is 48.3". With these temperatures and precipation, the majority of the county scores as an 7B 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 Nassau County is 1,393,368 with 455,032 households. These households are spread across 133 unique municipalties (not all shown).