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St. Clair County, MO (shown in white) has 674.98 mi² of land area and 27.08 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 675.8' to a high of 1,036.7', with a weighted average of 821.3' above sea level.
Temperatures range from average lows around 21.9°F to average highs around 90.3°F. A year-round daily temperature averages 56.5°F. Average annual precipation is 46.9". 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 9,951 with 4,216 households. These households are spread across 7 unique municipalties (not all shown).
