The monsoon type of climate is characterized by a distinct
seasonal pattern. The weather conditions greatly change from one season to the
other. Four main seasons can be identified in India the cold weather season,
the hot weather season, the advancing monsoon and the retreating monsoon.
Monsoon, unlike the trade winds, are not steady winds but are pulsating in nature. They are affected by different atmospheric conditions
encountered by it on its way over the warm tropical seas. The monsoon arrives
at the southern tip of the Indian peninsula by the first week of June.
Subsequently, it divides into two the Arabian Sea branch and the Bay of
Bengal branch. The Arabian Sea branch reaches Mumbai about ten days later on approximately
the 10th of June. This is a fairly rapid advance. The Bay of Bengal branch also
advances rapidly and arrives in Assam in the first week of June.