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Grundy County, IL (shown in white) has 418.13 mi² of land area and 12.4 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 479' to a high of 698.8', with a weighted average of 583.7' above sea level.
Temperatures range from average lows around 15.2°F to average highs around 85°F. A year-round daily temperature averages 50.5°F. Average annual precipation is 41.8". 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 Grundy County is 53,648 with 20,449 households. These households are spread across 13 unique municipalties (not all shown).
