The document summarizes the Indian monsoon system. It describes that monsoons are seasonal reversals of winds and rainfall caused by differential heating of land and ocean. The most prominent monsoon occurs over the Indian subcontinent between June and September, as the ITCZ moves northward. Southwesterly winds pick up moisture over the ocean and produce heavy rainfall when they hit the Himalayas. In winter, the ITCZ moves south and the monsoon winds reverse direction, bringing dry conditions to India.