Most of the population of shenzhen comes from other places, so shenzhen is called "migrant city".
At the end of 2008, there were 8,768,300 permanent residents in shenzhen, including 2,287,700 registered residents and 6,487,600 non-registered residents. The birth rate is 14.12‰, the death rate is 0.98‰, and the natural growth rate is 13.14‰. The population density is 4,334 people per square kilometer.
Shenzhen also has millions of temporary migrants, so the city's population is believed to exceed 12 million. The administration said the population was between 13 and 15 million as of December 31, 2007.
Shenzhen city is a subtropical Marine climate. The climate is mild, with an annual average temperature of 22.3℃, the highest temperature of 38.7℃ and the lowest temperature of 0.2℃. Adequate rainfall, April to September for the annual rainy season, the annual rainfall of 1924.7 mm. The sunshine time is long, the average annual sunshine hours is 2060 hours, the annual solar radiation amount is 5225 years megajoule/square meter. The prevailing wind direction is east-southeast, and it is affected by tropical cyclones (typhoons) 4 to 5 times on average every year.
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