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Montgomery County, IL (shown in white) has 703.77 mi² of land area and 5.97 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 508.5' to a high of 757.9', with a weighted average of 639.3' above sea level.
Temperatures range from average lows around 20.2°F to average highs around 88.1°F. A year-round daily temperature averages 54.8°F. Average annual precipation is 44.2". 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 Montgomery County is 27,936 with 11,011 households. These households are spread across 20 unique municipalties (not all shown).
