I searched for the data sources of WU, and it turns out that WU's temperature comes not only from the airport's weather station. WU has over 8,000 personal weather stations and MADIS stations worldwide. So today, the METAR at Bao'an Airport reported a high of 24 degrees, while WU reported a high of 25 degrees, possibly due to referencing nearby personal weather stations. The WU official website also sells eight types of weather products. In theory, you could buy a weather station, install it near the airport, and register it with WU to provide temperature references for the area.