Geography

The monsoon is pulsating in nature. affected by different atmospheric conditions encountered by it on way over the warm tropical seas. Around the time of its arrival the normal rainfall increases suddenly and continues constantly for several days. This is known as the 'burst of the monsoon'.
The onset of the monsoon : The monsoon arrives at the southern tip of the Indian Peninsula generally by the first week of the June. Subsequently, it divides into two -
1. The Arabian sea Branch. 2. The Bay of Bengal Branch.
1. The Arabian sea Branch reaches Mumbai about 10 days later on approximately the 10th of June. This is fairly rapid advance.
2. The Bay of Bengal branch also advances rapidly and arrives in Assam in the first week of June.
3. The lofty mountains causes the monsoon winds to deflect towards the west over Ganga plains.
4. By mid June the Arabian sea branch of the monsoon arrives over Saurashtra-Kuchchh and the central part of the country.
5. Both the branches of the monsoon merge over the northwestern part of the Ganga plain.
6. Delhi receives the monsoon shows from the Bay of Bengal branch by the end of June.
7. By the first week of July, Western Uttar Pradesh, Punjab, Haryana and Eastern Rajasthan experience the monsoon.
8. By mid July the monsoon reaches Himachal Pradesh and rest of the country.
Withdrawal Of The Monsoon
1. It is a gradual process. It begins in northwestern states of India by early September.
2. By mid October, it withdraws completely from the northern half of the peninsula.
3. The withdrawal from the southern half of the peninsula is fairly rapid.
4. By early December, the monsoon has withdrawn from the rest of the country.