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Mean annual rainfall in the country ranges from 700 to 5,000 mm (28 to 197 in) although most places in Vietnam receive between 1,400 and 2,400 mm (55 and 94 in). [1]: 33 Bạch Mã National Park is the wettest place in Vietnam, which annual precipitation is 3,500 mm (140 in) and up to 8,000 mm (310 in) at the 1,448-metres tall summit. [13]
It belongs to Vietnam Meteorological and Hydrological Administration (VMHA) under the Ministry of Natural Resources and Environment with authority to issue forecasting/warning information for weather, climate, hydrology, water resource, marine weather (i.e. hydro-meteorology) and provide hydro-meteorology services. [1]
Mean annual rainfall in the country ranges from 700 to 5,000 mm (28 to 197 in) although most places in Vietnam receive between 1,400 to 2,400 mm (55 to 94 in). [5]: 33 The majority of rainfall occurs during the rainy season, which is responsible for 80%–90% of the annual precipitation.
July 17, 2010 — Tropical Storm Conson (Bão số 1) brought heavy rainfall over the northern half of Vietnam, with 127 mm (5.0 in) of rain falling in Nam Định. August 24, 2010 — Tropical Storm Mindulle (Bão số 3) brought widespread flooding, with at least 10 people bring killed and losses reaching ₫850 billion (US$43.3 million). [19]
Due to the heavy rain, water levels in major river systems in northern Vietnam, including the Red River and Thái Bình River systems, rose rapidly, causing significant flooding in 20 out of 25 northern provinces from 8 to 15 September. [27] Thao River's upstream section in Lào Cai surpassed the historical flood level of 1971 by 0.27 m (11 in ...
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 ...
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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.