with mountains accounting for 70% of the county's area. The forest greening rate of the entire region has reached 74%. In addition, Yanqing is rich in geothermal, solar, wind and other new and renewable energy sources, accounting for 25% of energy consumption, and is one of the first national green energy demonstration counties and a new and renewable energy demonstration area in Beijing. The highest temperature recorded was 39 °C, which occurred on June 10, 1961. Prior to 2016 and the lowest temperature recorded was -27.3 °C (-17.14 °F), which occurred on January 23, 1973, however, on January 23, 2016, the lowest temperature recorded was -29.8 °C (-21.64 °F), the lowest temperature recorded in Beijing in 30 years. The year with the highest precipitation from June to August was 1964 with 747.1 mm, and the year with the lowest was 1965 with 274 mm. The average annual sunshine in one district of Yanqing County is 2806.5 hours, with an annual sunshine percentage of 63%, the highest sunshine hours and solar radiation in Beijing. The annual average concentration value of PM2.5 in Yanqing District was 68.0 micrograms per cubic meter, ranking first in air quality over other districts in Beijing. Administrative divisions There are 3 subdistricts, 11 towns, and 4 townships in the district. Urban area of Yanqing District The Yanqing District government is located at Rulin Subdistrict. The urban area of Yanqing District is composed of Baiquan Subdistrict, Rulin Subdistrict, Xiangshuiyuan Subdistrict and Yanqing Town, with a population that exceeds 100,000. The urban area has a central business district and exhibition center. List of subdivisions of Yanqing District Population At the end of 2019, there were 145,474 households in Yanqing District. Among them, 70,386 agricultural households. The registered population is 289,093 people. Among them, 14,045 are female permanent residents. The resident population is 35.7, of which 4.5 are permanent migrants, accounting for 12.6% of the resident population. Among the permanent population, the urban population is 21.3, accounting for 59.7% of the permanent population. The permanent population was born at 8.22‰, and the birth rate was 5.84‰. The natural growth rate of the permanent population was 2.38‰. Culture and tourism The district is rich in historical sites and outdoor attractions. The most visited attraction of Yanqing is Badaling, a restored section of the Great Wall, that is highly popular with tourists. Badaling Remnant (Shixiaguan) and Shuiguan sections of the Great Wall