According to Classical hypothesis, the opposite nature of water and land is responsible for the origin of Summer Monsoon. According to this hypothesis, land area takes less time to get warm and’ cold, while water takes more time to get warm and cold. In summer season, due to land getting warmed up quickly, low air pressure is developed. On the other hand, water not getting warmed up quickly remains cold, and hence high air pressure is developed there. Thus, in this season, winds start blowing from sea to land. Due to being originated from sea, these winds contain humidity and thus heavy rainfall is caused by these winds.
