Shenzhen has a maritime climate with a transition from subtropical to tropical, with sunny weather and abundant precipitation. The annual average temperature is 22.5℃, and the coldest January average temperature is 15.4℃ (average maximum temperature: 20℃, average minimum temperature: 12℃). The weather is warm, but there is occasional chill when cold air strikes, and the temperature is above 8 C. Therefore, a quilt of 5 or 6 kilograms is enough for winter in Shenzhen.