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St. Johns County, FL (shown in white) has 600.64 mi² of land area and 220.89 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 0' to a high of 68.9', with a weighted average of 15.1' above sea level.
Temperatures range from average lows around 46.9°F to average highs around 91.5°F. A year-round daily temperature averages 71.5°F. Average annual precipation is 52.7". 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 St. Johns County is 333,703 with 126,220 households. These households are spread across 14 unique municipalties (not all shown).
