The last fuelling drill began on Wednesday. Technicians say they have to cool down the propeller for safety, as the launch is taking place during some of the year's hottest months.

Meanwhile, the center's meteorological observatory is sending out two hydrogen balloons each day for the latest weather data. With a 2 metres diameter, the balloon can reach up to 30 kilometres above the ground.

The balloon's monitor box collects temperatures and air pressure figures, sending the data to ground radars every 2 seconds.

In addition, there are 7 weather monitoring stations on the ground, tracking any approaching abnormal weather. The Jiuquan Satellite Launch Centre holds two weather consultation meetings each day.

The latest numbers show that cooler temperatures are headed towards the area, good news for Shenzhou-9's fast approaching launch.