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DeKalb County, IL (shown in white) has 631.34 mi² of land area and 3.31 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 649.6' to a high of 964.6', with a weighted average of 830.1' above sea level.
Temperatures range from average lows around 12.8°F to average highs around 83.2°F. A year-round daily temperature averages 48.4°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 DeKalb County is 101,281 with 38,754 households. These households are spread across 13 unique municipalties (not all shown).
