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Massac County, IL (shown in white) has 237.15 mi² of land area and 4.94 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 298.6' to a high of 561', with a weighted average of 392.7' above sea level.
Temperatures range from average lows around 25.3°F to average highs around 88.7°F. A year-round daily temperature averages 57.6°F. Average annual precipation is 55". With these temperatures and precipation, the majority of the county scores as an 7A 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 Massac County is 14,059 with 5,828 households. These households are spread across 3 unique municipalties (not all shown).
