Vietnam geography and weather

Vietnam Geography
Shaped like an elongated S, Vietnam stretches the length of the Indochinese Peninsula and covers a surface area of 128,000 square miles-making it roughly the size of Italy or, in the U.S., New Mexico. China lies to the north, Laos and Cambodia to the west, and the South China Sea to the east.
Topographically, Vietnam is a verdant tapestry of soaring mountains, fertile deltas, primeval forests inhabited by exotic fauna, sinuous rivers, mysterious caves, otherworldly rock formations, and heavenly waterfalls and beaches. Beyond nature, the curious and open-minded visitor will find in Vietnam a feast of culture and history.
For convenience, the country can be thought of as comprising three unique areas: north, central, and south. The north is known for its alpine peaks, the Red River Delta, the plains of Cao Bang and Vinh Yen, enchanting Halong Bay, and historic Hanoi, as well as for the diversity of its ethnolinguistic minorities.
Central Vietnam, also home too many ethnic minorities, is characterized by high temperate plateaus rich in volcanic soil and by spectacular beaches, dunes, and lagoons. It is also the location of the ancient imperial city of Hue. In the South, visitors encounter modern life in Ho Chi Minh City (formerly Saigon) and the fertile alluvial delta of the Mekong River. Vietnam's territory also encompasses a large continental shelf and thousands of archipelagic islands.

Weather in Vietnam
Vietnam has a tropical monsoon climate, with humidity averaging 84 % throughout the year. However, because of differences in latitude and the marked variety of topographical relief, the climate tends to vary considerably from place to place. During the winter or dry season, extending roughly from November to April, the monsoon winds usually blow from the northeast along the China coast and across the Gulf of Tonkin, picking up considerable moisture; consequently the winter season in most parts of the country is dry only by comparison with the rainy or summer season. During the southwesterly summer monsoon, occurring from May to October, the heated air of the Gobi Desert rises, far to the north, inducing moist air to flow inland from the sea and deposit heavy rainfall
Annual rainfall is substantial in all regions and torrential in some, ranging from 1,200 to 3,000 millimeters (47.2 to 118.1 in). Nearly 90 % of the precipitation occurs during the summer. The average annual temperature is generally higher in the plains than in the mountains and plateaus. Temperatures range from a low of 5 °C (41 °F) in December and January, the coolest months, to more than 37 °C (98.6 °F) in April, the hottest month. Seasonal divisions are more clearly marked in the northern half than in the southern half of the country, where, except in some of the highlands, seasonal temperatures vary only a few degrees, usually in the 21–28 °C (69.8–82.4 °F) range.