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Barnwell County, SC (shown in white) has 548.38 mi² of land area and 8.88 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 78.7' to a high of 387.1', with a weighted average of 232.2' above sea level.
Temperatures range from average lows around 34°F to average highs around 93.2°F. A year-round daily temperature averages 64.7°F. Average annual precipation is 47.7". With these temperatures and precipation, the majority of the county scores as an 8A 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 Barnwell County is 20,794 with 8,550 households. These households are spread across 7 unique municipalties (not all shown).
