China's Antarctic expedition always arrives in the Antarctic for scientific investigation in winter (northern hemisphere). Why?

Because the angle between the earth's axis and the sun-earth plane is greater than 90, the northern and southern hemispheres are heated differently and the seasons are opposite, which means it is winter here and summer in Australia. At this time, the Antarctic has high temperature and long sunshine, which is suitable for investigation. Moreover, there is less ice and snow, easy to contact the land (the Antarctic continent is covered with thick ice and snow), less bad weather and convenient outdoor activities.