What's the climate like in Sydney?

The climate of Sydney is close to Shanghai, Nanjing and Hangzhou in China, with four distinct seasons. But there is a difference that the temperature difference between day and night is larger than that in Shanghai. Sometimes the sun shines 30 degrees at noon, and it's only 20 degrees at night when the sun goes down. You have to cover the quilt all year round. But winter is absolutely stable and not cold, and the situation below zero is very rare. On the whole, the climate is very pleasant.