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McDonough County, IL (shown in white) has 589.32 mi² of land area and 0.78 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 492.1' to a high of 794', with a weighted average of 665.7' above sea level.
Temperatures range from average lows around 16°F to average highs around 85.9°F. A year-round daily temperature averages 51.6°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 McDonough County is 26,564 with 11,166 households. These households are spread across 12 unique municipalties (not all shown).
