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Sully County, SD (shown in white) has 1,006.73 mi² of land area and 63.47 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 1,597.8' to a high of 2,060.4', with a weighted average of 1,808.9' above sea level.
Temperatures range from average lows around 4.6°F to average highs around 89.4°F. A year-round daily temperature averages 45.6°F. Average annual precipation is 20.2". With these temperatures and precipation, the majority of the county scores as an 4B 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 Sully County is 1,459 with 641 households. These households are spread across 3 unique municipalties (not all shown).