Why do astronauts avoid returning to Earth in July and August?

Because the weather is hot and the temperature is high. According to the inquiry, China Space Agency shows that.

1, high temperature effect: July and August are the high temperature seasons in many areas, especially in some places, and it may be very hot in summer. High temperature has a negative impact on astronauts and the equipment of the return capsule, which increases the thermal stress and the challenge of thermal management.

2. Solar activity: Summer is the peak of solar activity, and the increase of solar flares and cosmic rays has a certain impact on space capsules and astronauts. Choosing to land during the period of low solar activity can reduce this potential impact.