Beijing 12℃ Do you want to wear a down jacket?

Don't. Down jacket plays a role in keeping warm. You can wear a down jacket when the weather is very cold. Generally, you can wear down jackets when the temperature is 0- 10, especially in Beijing. At this temperature, the temperature difference between morning and evening is large, and the air is cold, so you can wear down jackets. 12℃ means that the temperature is still relatively warm, so don't wear down jacket because it is a little hot.