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St. Joseph County, IN (shown in white) has 457.78 mi² of land area and 3.6 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 669.3' to a high of 899', with a weighted average of 772' above sea level.
Temperatures range from average lows around 16.2°F to average highs around 83.1°F. A year-round daily temperature averages 49.4°F. Average annual precipation is 42.4". 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 St. Joseph County is 275,854 with 108,535 households. These households are spread across 15 unique municipalties (not all shown).