Zhongshan City is a prefecture-level city under the jurisdiction of Guangdong Province, China, and is known as the "land of plenty". Zhongshan has outstanding people and beautiful scenery. With the rapid development after the reform and opening up, Zhongshan has become one of the "four little dragons" in Guangdong. City Overview Zhongshan is one of the [1] cities in China named after great men. Zhongshan, known as Xiangshan in ancient times, is famous for its outstanding people and celebrities. 1866165438+10/2. Dr. Sun Yat-sen, the great forerunner of China's democratic revolution, was born in Cuiheng Village, Xiangshan County. In memory of Dr. Sun Yat-sen, Xiangshan was renamed Zhongshan on 1925. [2] The annual average temperature in Zhongshan City is 23.0℃. The mileage of urban highway is1665.8km; There are three foreign trade ports in this city: there are five airports around the city: railway transportation passes through Guangzhou to Zhongshan City, which is located in the lower reaches of the west and the Beijiang River in the south-central Pearl River Delta. It is connected with Panyu District of Guangzhou City and Shunde District of Foshan City in the north, Jiangmen City, Xinhui District and Doumen District of Zhuhai City in the west, Zhuhai City in the southeast, and Shenzhen City and Hong Kong Special Administrative Region in the east across the Lingdingyang Sea. The whole territory lies between 2211'and 22 47' north latitude and113 09' ~13 46' east longitude. The urban land is 86 kilometers north of Guangzhou, 65 kilometers southeast of Macau, and 52 nautical miles from zhongshan port waterway to Hongkong. Climate characteristics Zhongshan City Zhongshan is located in the south of the Tropic of Cancer, on the northern edge of the tropics, with abundant sunshine, abundant heat and warm climate. The solar radiation angle is large, and the temperature is high all year round. The annual solar radiation is 105.3 kcal/cm2, of which the scattered radiation is 57.7 kcal/cm2 and the average direct radiation is 45.5 kcal/cm2. The annual total solar radiation is the strongest in July, reaching 12kcal /cm2, and the weakest in February, only 5.6kcal /cm2. Sufficient illumination time, with high-yield light energy utilization potential. Average annual illumination 1843.5 hours, accounting for 42% of the annual illumination. The least annual light hours are from early February to early April, with an average of 2.8 hours per day, and the most are from July to 10, with an average of 6.7 hours per day. The climate is warm and suitable for planting all year round. The average temperature over the years is 265438 0.8℃. The interannual average temperature has not changed much. The hottest year is July, with an average daily temperature of 28.4℃. The coldest month is 65438+ 10, and the average daily temperature is 13.2℃. The frost-free period is long and the frost days are few, with an average of only 3.5 days per year. Under the regulation of ocean airflow, the climate change in winter is alleviated. Relative humidity and evaporation. The average relative humidity for many years is 83%, the maximum value is 86% of 1957, and the minimum value is 8 1% of 1977. In a year, it changes greatly from May to June, and changes little from 65438+February to 65438+1October. The annual average evaporation is 1448. 1mm, the maximum is 197 1 year is 1605. 1mm, and the minimum is 1965/kloc.