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Henderson County, IL (shown in white) has 378.79 mi² of land area and 16.43 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 518.4' to a high of 780.8', with a weighted average of 640.1' above sea level.
Temperatures range from average lows around 14.3°F to average highs around 86°F. A year-round daily temperature averages 51.2°F. Average annual precipation is 40.2". 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 Henderson County is 6,291 with 2,792 households. These households are spread across 9 unique municipalties (not all shown).
