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Clay County, IL (shown in white) has 468.35 mi² of land area and 1.18 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 400.3' to a high of 639.8', with a weighted average of 484.9' above sea level.
Temperatures range from average lows around 20.9°F to average highs around 89.1°F. A year-round daily temperature averages 55.1°F. Average annual precipation is 50.9". 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 Clay County is 13,259 with 5,498 households. These households are spread across 6 unique municipalties (not all shown).
