1. Hainan is located in the South China Sea of China, with a subtropical climate, which is warm and humid all year round, hot and humid in summer and warm and comfortable in winter. Qingdao, located in the northeast coast of China, has a temperate maritime climate with four distinct seasons, warm and humid in summer and cold and dry in winter.

2. The average summer temperature in Hainan is between 28 and 32 degrees Celsius, with high temperature and high humidity. The average summer temperature in Qingdao is between 24 and 28 degrees Celsius, slightly lower than that in Hainan.