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Monsoon rains in Kolkata, India

Piyal Adhikary / EPA

Commuters wade through water during a heavy rain shower in Kolkata, India on June 17. Monsoon rains enter India's mainland from the southern state of Kerala at the end of May or in the first week of June, and then progress to cover the rest of the country by July.

Piyal Adhikary / EPA

Rickshaw wallahs at work as monsoon rains fall in Kolkata on June 17.

Related content: India struggles to perfect art of monsoon forecasting.