Vietnam is located in both a tropical and a temperate zone. It is characterized by strong monsoon influences, but has a considerable amount of sun, a high rate of rainfall, and high humidity. Regions located near the tropics and in the mountainous regions are endowed with a temperate climate.
The annual average temperature ranges from 22 ํC to 27 ํC. In Hanoi, the average temperature is 23 ํC, in Ho Chi Minh City it is 26 ํC, and in Hue it is 25 ํC. There are two distinguishable seasons. The cold season occurs from November to April and the hot season from May to October. The difference in temperature between the two seasons in southern Vietnam is almost unnoticeable, averaging 3 ํC.
The most noticeable variations are found in the northern provinces where differences of 12 ํC have been observed. There are essentially four distinct seasons, which are most evident in the northern provinces.