Theory:

A monsoon is a seasonal change. Monsoons cause wet and dry seasons throughout much of the tropics. Monsoons in India are often associated with the Indian Ocean.
 
Monsoons always blow from cold to warm regions. They can be classified as Summer and Winter monsoons respectively.
 
Both the summer and the winter monsoons determine the climate for most of India and South-east Asia.
 
Summer Monsoon:
The summer monsoon is associated with heavy rainfall. It usually happens between April and September. It brings a humid climate and torrential rainfall.
 
Importance of Summer Monsoon:
  • When the summer monsoon is late or weak, the economy of the region suffers.
  • Electricity becomes more expensive.
 
Winter Monsoon:
The Indian Oceans winter monsoon lasts from October to April. The dry winter monsoon blows from the north-east.
 
Winter monsoons are less powerful than summer monsoons in South-east Asia because the Himalaya Mountains prevent much of the wind and moisture of the monsoons from reaching the coast.
 
Other Monsoons:
The Asian-Australian monsoon, which includes the Indian Ocean, stretches from northern Australia to Russia's Pacific coast.
 
The North American monsoon happens once a year, usually in the middle of summer.
 
The North American monsoon can be a natural aid to firefighters. It is also the primary water source for most desert ecosystems in the region.