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Randolph County, IL (shown in white) has 575.37 mi² of land area and 21.68 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 341.2' to a high of 698.8', with a weighted average of 465.9' above sea level.
Temperatures range from average lows around 22.9°F to average highs around 89.4°F. A year-round daily temperature averages 56.5°F. Average annual precipation is 46.8". 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 Randolph County is 29,871 with 11,584 households. These households are spread across 14 unique municipalties (not all shown).
