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[1]: 33 For example, there are more rainy days in the drier season during winter in Yên Bái Province due to drizzle than there are rainy days in the main rainy season. [ 1 ] : 33 Drizzle is a weather phenomenon that is characteristic of the weather in winter in the north and north central coast.
In the fall, it is rainy, cool with temperature around 22 to 28 degrees Celsius. In the winter, it is humid, slight rain with temperature about 12 to 16 degrees Celsius. Annual average precipitation is around 2,000-2,300 mm. Heaviest rainy season is from September to November. From April to August is the dry season.
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Total rainy days within a year are between 120 and 170 days (the standard level of tropical regions is 150–160 days) with a total rainfall of some 1,500 - 2,750 mm. The average humidity is around 80 - 82% and humidity in the dry season is 10-12%, lower than that of the rainy season; humidity varies considerably between areas.
The wet season (sometimes called the rainy season or monsoon season) is the time of year when most of a region's average annual rainfall occurs. [1] Generally, the season lasts at least one month. [2] The term green season is also sometimes used as a euphemism by tourist authorities. [3]
Operation Popeye (Project Controlled Weather Popeye / Motorpool / Intermediary-Compatriot) was a military cloud-seeding project carried out by the U.S. Air Force during the Vietnam War in 1967–1972.
Although the amount of water is comparably high, the distribution is uneven in time and in space. The rainy season lasts 4–5 months and during this time 75-85% of the total volume of precipitation occurs. The water availability in Vietnam is supposed to be 830-840 billion m 3 annually from which approximately 37% is generated on Vietnamese ...