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Whiteside County, IL (shown in white) has 684.1 mi² of land area and 12.31 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 570.9' to a high of 862.9', with a weighted average of 656.8' above sea level.
Temperatures range from average lows around 12.4°F to average highs around 84°F. A year-round daily temperature averages 49.1°F. Average annual precipation is 40.9". 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 Whiteside County is 55,021 with 23,286 households. These households are spread across 13 unique municipalties (not all shown).
