Monsoon season - Mùa Gió Chướng,

Indochina marks the mainland part of the Southeast Asian peninsula. The pattern is quite simple: the
southwest monsoon, normally called the rainy season, is appearing annually out of the direction of
India and south of it, crossing the Indian Ocean and moving into the countries Malaysia, Thailand
Cambodia, Viet Nam and Burma/Myanmar. Much of it is pouring down at the bordering mountain
ranges as the Barisan Mountains in Sumatra and the Tenasserim Mountain Range in south
Thailand. As further it penetrates inland, as weaker it gets. It's time is between May to October.
There are big local differences.
The northeast monsoon is of a very different kind. It brings far less rain, rather dry and cooler winds
from the inner Asian continent (China). It's time is from December to February.
Monsoon, actually the name of a wind, is altogether a complicated climate activity around the
equatorial zones of the earth. It's triggered by the changing position of the sun around the equator
along the annual seasons. High- and low pressure areas and temperature differences on the surface
of the earth and water temperatures in the oceans cause strong winds and overregional air streams
who last for months. The monsoon affects different parts of Southeast Asia in a different way. It
depends on their proximity to the equator, to the open sea and to the existence or absense of
mountains and mountain chains.
Considered the annual variations of the monsoon, generally spoken in Indochina the southwest
monsoon starts approximately in May and lasts until September / October / November. It brings
heavy rain. At the leeside of the mountains rainfall is significant less than at the luvsides. A good
example for that is the Tenasserim Mountain Range in the south of Thailand. Ranong is the most
rainy province in Thailand, for it get's much of the southwest monsoon which is coming from India
and is continuing northeast deeply into China. As further distant an area is from the coast, as less
rain it receives. In Surin, northeast Thailand, there happens a third of the rainfall only as comes
down at the coasts of the Andaman Sea.
The climax of the southwest monsoon, in all-day-language called the "rainy season", is then usually
in September, might stretch into October, then ceasing. From early November on it's usually over.
The four months from November to February mark the best times concerning climate/weather
conditions in Southeast Asia, for it's dry, still green and less hot than in the other nine months of the
After a certain, shorter time of transfer it's changing into the northeast monsoon. In this time,
between December and February, the wind is coming from inner Asia, namely China and brings cool
and mostly dry air. In some regions as the north of Laos, Viet Nam or Thailand (e.g. in the Golden
Triangle) it can be quite cool in the evenings and particularly in the mornings and forenoons.
Sometimes the wind is coming there down from the altitudes of the Tibetian Plateau in the Himalaya.
There is also a southeast monsoon streaming out of the Australian mainland. It starts dry and get's
wet over the sea in the Indonesian Archipelago. The southeast monsoon is reaching in it's last
outstretches maximal until Borneo, the southern tip of the Malay Peninsula including Singapore.
In the shorter transitional times between the two monsoons the speed of the wind is lower than
normally. Sometimes there are heavy thunderstorms and blizzards, when a low-pressure area is
hanging over a region, particularly queuing at mountain ranges.

Pro: Mr Asienreisender

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