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Washington County, IL (shown in white) has 562.6 mi² of land area and 1.31 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 390.4' to a high of 580.7', with a weighted average of 482.6' above sea level.
Temperatures range from average lows around 21.3°F to average highs around 88.5°F. A year-round daily temperature averages 55.6°F. Average annual precipation is 46.6". With these temperatures and precipation, the majority of the county scores as an 6B 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 13,615 with 5,664 households. These households are spread across 13 unique municipalties (not all shown).
