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Why does Lake Nicaragua’s water level change during the year?

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The water level of Lake Nicaragua fluctuates throughout the year due to seasonal weather patterns. Specifically, the water level falls during the dry season, which lasts from December to April, and rises during the rainy season, which occurs from May to October.1

Additionally, while the lake is considered tideless, it experiences a daily fluctuation in water level caused by east winds blowing up the San Juan River valley.1