<P> The influence of the Southwest Monsoon is felt as far north as in China's Xinjiang . It is estimated that about 70% of all precipitation in the central part of the Tian Shan Mountains falls during the three summer months, when the region is under the monsoon influence; about 70% of that is directly of "cyclonic" (i.e., monsoon - driven) origin (as opposed to "local convection"). </P> <P> Around September, with the sun fast retreating south, the northern land mass of the Indian subcontinent begins to cool off rapidly . With this air pressure begins to build over northern India, the Indian Ocean and its surrounding atmosphere still holds its heat . This causes cold wind to sweep down from the Himalayas and Indo - Gangetic Plain towards the vast spans of the Indian Ocean south of the Deccan peninsula . This is known as the Northeast Monsoon or Retreating Monsoon . </P> <P> While travelling towards the Indian Ocean, the dry cold wind picks up some moisture from the Bay of Bengal and pours it over peninsular Indi) and parts of Sri Lanka . Cities like Chennai, which get less rain from the Southwest Monsoon, receive rain from this Monsoon . About 50% to 60% of the rain received by the state of Tamil Nadu is from the Northeast Monsoon . In Southern Asia, the northeastern monsoons take place from December to early March when the surface high - pressure system is strongest . The jet stream in this region splits into the southern subtropical jet and the polar jet . The subtropical flow directs northeasterly winds to blow across southern Asia, creating dry air streams which produce clear skies over India . Meanwhile, a low pressure system develops over South - East Asia and Australasia and winds are directed toward Australia known as a monsoon trough . </P> <P> The East Asian monsoon affects large parts of Indo - China, Philippines, China, Taiwan, Korea and Japan . It is characterised by a warm, rainy summer monsoon and a cold, dry winter monsoon . The rain occurs in a concentrated belt that stretches east - west except in East China where it is tilted east - northeast over Korea and Japan . The seasonal rain is known as Meiyu in China, Jangma in Korea, and Bai - u in Japan, with the latter two resembling frontal rain . </P>

The north eastern winter monsoon winds cause rainfall along