Shanghai, also known as Hu, is the largest and most prosperous city in China. As one of the main port cities in China, hundreds of foreign travelers arrived at Shanghai to start their trips in China. It is a bustling international metropolis which plays an important role in China’s economy, culture, transport, industry, finance, trade and exhibition. With a pleasant northern subtropical maritime monsoon climate, Shanghai enjoys four distinct seasons, generous sunshine and abundant rainfall. Its spring and autumn are relatively short compared with summer and winter. The average annual temperature is 16°C. The city is frost-free for up to 230 days a year, and receives an average annual rainfall of 1,200 mm. Shanghai winter temperatures can drop below zero (Celsius) from late January to mid-February and views may be gray and misty. Spring brings warmth from April to mid-May. Autumn is from late September to mid-November, which can be very cool.