Long An is in humid monsoon tropical climate. As being bordered by the South East and South West, it is both of specific characteristics of the Mekong River Delta and of its special characteristics of the East Sea. The monthly average temperature is 270C. The annual average humidity is 70-80%. In dry season from November to April, there is north-easterly wind with frequency of 60-70%. In rainy season from May to October, there is south-westerly wind with frequency of 70%.