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When does Kolkata receive most of its annual rainfall?

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Kolkata receives the majority of its annual rainfall during the hot and wet season, which occurs from mid-June to September. During this period, the region is influenced by monsoon winds blowing from the southwest, which bring significant precipitation.12

While the city averages about 64 inches (1,625 mm) of rain annually, the distribution is highly seasonal. For instance, August alone typically accounts for an average of 13 inches (330 mm) of rainfall, whereas the winter months from late November to February are largely rainless.12