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St. Mary's County, MD (shown in white) has 358.56 mi² of land area and 405.69 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 0' to a high of 167.3', with a weighted average of 35.6' above sea level.
Temperatures range from average lows around 27.9°F to average highs around 88.4°F. A year-round daily temperature averages 58.2°F. Average annual precipation is 49.5". With these temperatures and precipation, the majority of the county scores as an 7B 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 St. Mary's County is 116,418 with 42,868 households. These households are spread across 11 unique municipalties (not all shown).
