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LaSalle County, IL (shown in white) has 1,135.16 mi² of land area and 13.02 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 442.9' to a high of 905.5', with a weighted average of 657.8' above sea level.
Temperatures range from average lows around 14°F to average highs around 85.1°F. A year-round daily temperature averages 49.9°F. Average annual precipation is 42.1". 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 LaSalle County is 109,497 with 45,159 households. These households are spread across 30 unique municipalties (not all shown).