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St. Clair County, MI (shown in white) has 721.52 mi² of land area and 114.99 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 570.9' to a high of 853', with a weighted average of 678.9' above sea level.
Temperatures range from average lows around 15.3°F to average highs around 83.1°F. A year-round daily temperature averages 48.4°F. Average annual precipation is 36". With these temperatures and precipation, the majority of the county scores as an 6A 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 St. Clair County is 161,633 with 66,194 households. These households are spread across 11 unique municipalties (not all shown).
