Gros Cailloux, in Black River, Mauritius, is home to roughly 3,400 people in the Indian/Mauritius time zone at 20.2°S latitude.
In 2025, Gros Cailloux recorded an average annual temperature of 77°F. The hottest temperatures reached 92°F in January; the coolest were 60°F in July. Total precipitation for the year was 32 inches, with the wettest month being December.
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