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Lewis County, ID (shown in white) has 478.82 mi² of land area and 0.9 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 1,092.5' to a high of 4,799.9', with a weighted average of 3,413.3' above sea level.
Temperatures range from average lows around 21.5°F to average highs around 89.4°F. A year-round daily temperature averages 47.2°F. Average annual precipation is 22". 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 Lewis County is 3,693 with 1,601 households. These households are spread across 5 unique municipalties (not all shown).