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St. Charles County, MO (shown in white) has 560.5 mi² of land area and 31.92 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 406.8' to a high of 899', with a weighted average of 529.3' above sea level.
Temperatures range from average lows around 20.9°F to average highs around 88.5°F. A year-round daily temperature averages 55.6°F. Average annual precipation is 44.6". 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. Charles County is 422,881 with 161,439 households. These households are spread across 18 unique municipalties (not all shown).
