Climate of Halong City has typical character of oceanic temperature type with two separate seasons: summer lasts from May to October and winter is from November to April next year.
Located in tropical zone, Halong City receives average radiation 115.4 kcal/cm². Average annually temperature is 23ºC, the highest peak in June (28.6ºC) and the lowest point in February (16.7ºC). The yearly average humidity is 82.7%.
Due to of geography, Halong City is affected by North-East wind in winter and South-West wind in summer.
Halong Bay is located in the northeastern part of Vietnam and constitutes part of the western bank of Bac Bo Gulf, Halong Bay Attractionsincluding the sea area of Ha Long City and Cam Pha Town and part of Van Don island district. The site is 1553 sq. km with 1969 islands of various sizes, of which 989 have been named.
The area is recognized as the World Natural Heritage that is the area of 434 sq. km with 775 islands. It looks like a giant triangle with Dau Go Island (in the west), Ba Ham Lake (in the south) and Cong Tay Island (in the east) as its three angle points. The nearby area is the buffer area and areas classified as national beauty spots in 1962 by the Ministry of Culture and Information.
Halong Bay is also attached to glorious pages of Vietnamese history, with famous sites such as Van Don, a bustling trade port in the 12th century, charming Bai Tho Mountain, and not very far away from here is the Bach Dang River which witnessed two famous naval battles of the Viet’s ancestors against invaders. Also, Halong is one of the cradles of human kind with the glorious Halong culture in the late Neolithic age, discovered at such archeological sites as Dong Mang, Xich Tho, Soi Nhu and Thoi Gieng.
Halong bay is also home to great biodiversity with typical eco-systems like mangrove forest, coral and tropical forest. It is also home to thousands of plants and animals of numerous species, for example shrimp, fish and squid. Some species are particularly rare and can be found no where else.