Scientists have blamed this year's drought on a rare fierce war of temperatures over the Bay of Bengal and the Indian Ocean, which prevented formation of monsoon clouds.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/warm-sea-led-weak-monsoon
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere-and-ozone-layer
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere-science
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/monsoons
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall