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McLean County, IL (shown in white) has 1,183.25 mi² of land area and 3.01 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 600.4' to a high of 951.4', with a weighted average of 767.2' above sea level.
Temperatures range from average lows around 15.4°F to average highs around 86.2°F. A year-round daily temperature averages 51.1°F. Average annual precipation is 40.8". With these temperatures and precipation, the majority of the county scores as an 5B 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 McLean County is 171,670 with 69,425 households. These households are spread across 23 unique municipalties (not all shown).
