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St. Clair County, IL (shown in white) has 657.74 mi² of land area and 16.16 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 370.7' to a high of 679.1', with a weighted average of 466.3' above sea level.
Temperatures range from average lows around 24.5°F to average highs around 90°F. A year-round daily temperature averages 57.6°F. Average annual precipation is 46.4". With these temperatures and precipation, the majority of the county scores as an 6B 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 252,650 with 101,177 households. These households are spread across 31 unique municipalties (not all shown).
