Climate of China varies greatly. The northern zone (containing Beijing) has summer daytime temperatures of more than 30 degrees Celsius and winters of Arctic severity. The central zone (containing Shanghai) has a temperate continental climate with very hot summers and cold winters. The southern zone (containing Guangzhou) has a subtropical climate with very hot summers and mild winters.Due to a prolonged drought and poor agricultural practices, dust storms have become usual in the spring in China. Dust has blown to southern China and Taiwan, and has even reached the West Coast of the United States. Water, erosion, and pollution control have become important issues in China's relations with other countries.Hundreds of ethnic groups have existed in China throughout its history. The largest ethnic group in China by far is the Han. This group is diverse in itself and can be divided into smaller ethnic groups that share some traits.Over the last three millennia, many previously distinct ethnic groups in China have been Sinicized into a Han identity, which over time dramatically expanded the size of the Han population. However, these assimilations were usually incomplete and vestiges of indigenous language and culture often are still retained in different regions of China. Because of this, many within the Han identity have maintained distinct linguistic and cultural traditions, though still identifying as Han. Several ethnicities have also dramatically shaped Han culture, e.g. the Manchurian clothing called the qipao became the new "Chinese" fashion after the 17th century, replacing earlier Han styles of clothing such as the Hanfu. The term Chinese nation (Zhonghua Minzu) is usually used to describe a notion of a Chinese nationality that transcends ethnic divisions. Stay and Vacantion And Finds Best Hotels In china.