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McMullen County, TX (shown in white) has 1,139.8 mi² of land area and 16.98 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 147.6' to a high of 597.1', with a weighted average of 332.8' above sea level.
Temperatures range from average lows around 38.5°F to average highs around 99.6°F. A year-round daily temperature averages 71.7°F. Average annual precipation is 24.1". With these temperatures and precipation, the majority of the county scores as an 9A 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 McMullen County is 568 with 242 households. These households are spread across single municipalty.
