Climate resources in Hanoi are formed and exist thanks to the mechanism of tropical monsoon, rainfall, cold winters and hot summers. The total radiation in under 160 kcal/cm2 and radiation balance in under 75 kcal/cm2. Every year the influence of about 25-30 waves of the cold front. The average temperature for the year but not under 230C, song 01dưới month average temperature 180 c and amplitude of temperatures above 120 c) [2].The rainy season lasts from May to October and accounted for about 80% of the whole year's rainfall. Little rain season mainly small rain and drizzle lasted from November until April the following year, in December or January that has the least rainfall.Hanoi has remarkably cold winters compared to the other local South: cold front frequency higher, on low heat, the most significant is the number of days the medium bold, cold spell more harm than, the cold season lasts over and drizzle more also. Thanks to the cold winter in the plant of Hanoi as well as the Northern Plains, there is even a service unique in the eastern region.
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