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Jo Daviess County, IL (shown in white) has 600.92 mi² of land area and 17.68 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 584' to a high of 1,197.5', with a weighted average of 837.8' above sea level.
Temperatures range from average lows around 10.7°F to average highs around 84°F. A year-round daily temperature averages 47.7°F. Average annual precipation is 42.7". With these temperatures and precipation, the majority of the county scores as an 5A 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 Jo Daviess County is 21,957 with 9,801 households. These households are spread across 12 unique municipalties (not all shown).
