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Mumbai has over the last four years seen a gradual decline in the number of rain days, states data compiled by the disaster management department of the Brihanmumbai Municipal Corporation (BMC). While it rained on 106 days during the monsoon season in 2006, it only rained on 92 days in 2008. The number further came down to 86 in 2009.

Interestingly, however, even as the number of rain days decreased by almost 19%, for the last year when rains were deficient, the total rainfall witnessed has not deviated much.

Extreme rain events have increased due to climatic changes and global warming, a senior civic official said.