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Clinton County, IL (shown in white) has 473.94 mi² of land area and 29.2 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 390.4' to a high of 551.2', with a weighted average of 455.5' above sea level.
Temperatures range from average lows around 21.4°F to average highs around 89°F. A year-round daily temperature averages 56.2°F. Average annual precipation is 47". 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 Clinton County is 37,182 with 14,376 households. These households are spread across 12 unique municipalties (not all shown).
