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Mason County, WA (shown in white) has 959.55 mi² of land area and 91.49 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 0' to a high of 6,368.1', with a weighted average of 940.4' above sea level.
Temperatures range from average lows around 32.9°F to average highs around 78.2°F. A year-round daily temperature averages 51.2°F. Average annual precipation is 84.5". With these temperatures and precipation, the majority of the county scores as an 8B 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 Mason County is 68,630 with 26,750 households. These households are spread across 7 unique municipalties (not all shown).