On the basis of monitoring data string from 1981-2015 in southern Vietnam and statistical methods, reviews the trend of variation of the factors temperature, rainfall, the water level in the afternoon peak.The research results showed that the average temperature in the South The year 2015 is 27.5 ºc, the Supreme absolute temperature no trend increase markedly decreased, the absolute low temperature trend rise higher than average temperatures. The average rainfall is about the year 2015 is 1623.4 mm, the average amount of water on the upstream reservoir is smaller than average years from 25-45%.
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