Monsoon arrives in India approximately in:

Monsoon climate in India -

• India provides the world’s most-pronounced example of a monsoon climate.
• The wet and dry seasons of the Indian monsoon system, along with the annual temperature fluctuations, produce three general climatic periods over much of the country:
  1. hot wet weather from about mid-June to the end of September,
  2. cool dry weather from early October to February,
  3. hot dry weather (though normally with high atmospheric humidity) from about March to mid-June.
• The actual duration of those periods may vary by several weeks, not only from one part of India to another but also from year to year.
• Regional differences, which are often considerable, result from a number of internal factors—including elevation, type of relief, and proximity to bodies of water.
• Monsoon arrives in India approximately in the month of Early June.
• The duration of the monsoon is between 100-120 days from early June to mid-September.
• The monsoon arrives at the southern part of the Indian peninsula generally by the first week of June.
• The season is dominated by the humid southwest summer monsoon.

Tropical Monsoon climate - 

• Monsoons are the sea and land breezes on a larger scale.
• It is the seasonal reversal of wind with the change in the heating of the earth's surface. 
• Monsoon climate is characterized by distinct wet and dry seasons. 
• They can be found in the Indian sub-continent, Burma, Thailand, Laos, Cambodia, parts of Vietnam and south China, and northern Australia.
• The basic cause of monsoon climates is the difference in the rate of heating and cooling of land and sea.