This retreating monsoon also brings rain to areas that received less during the time of the advancing monsoon. The cooler and drier air flowing from the high Himalayas across the Bay of Bengal bring rain to areas of the eastern part of the Indian peninsula. The Northeast Monsoon brings less rain than falls during the Southwest Monsoon, but it bring vital moisture to areas that were missed earlier in the summer.
In southern Asia, the northeastern monsoon appears in December and lasts until early March. In Central Asia, wintertime temperatures are cold so that a dome of high-pressure air develops. As the jet stream passes over the area, it splits into the polar jet and the subtropical jet stream. The subtropical flow passes over southern Asia, creating clear skies over India. At the same time, warm water from the Philippines eastward develops into a low pressure system. The system spreads over Southeast Asia, Indonesia, and northern Australia. The winds then flow in a monsoon trough into the swamp wet areas of northern Australia and into the interior of the continent, bringing much-needed summertime rains.
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