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Union County, IL (shown in white) has 413.41 mi² of land area and 8.7 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 298.6' to a high of 1,013.8', with a weighted average of 500.5' above sea level.
Temperatures range from average lows around 23.9°F to average highs around 89.4°F. A year-round daily temperature averages 57.1°F. Average annual precipation is 52.9". 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 Union County is 16,960 with 6,861 households. These households are spread across 6 unique municipalties (not all shown).
