Is Haikou hot in summer? What is the weather like in winter?

Some trees lose their leaves in winter, but many plants are evergreen all year round. The weather in Haikou is very good in summer. Although the temperature is sometimes very high, I feel very comfortable, and it is cooler under the trees by the sea at night, because the air humidity is low, unlike some cities along the Yangtze River, which are sultry in summer and the sweat on the body surface is not easy to evaporate. It won't be very cold in winter, usually it's ten or twenty degrees.