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Washington County, WI (shown in white) has 430.64 mi² of land area and 5.02 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 780.8' to a high of 1,250', with a weighted average of 983.5' above sea level.
Temperatures range from average lows around 10.5°F to average highs around 82.2°F. A year-round daily temperature averages 45.7°F. Average annual precipation is 37". With these temperatures and precipation, the majority of the county scores as an 5A 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 Washington County is 139,904 with 57,161 households. These households are spread across 9 unique municipalties (not all shown).