What should I wear to the Badaling Great Wall in the middle and late April this year? I am afraid of the cold and live in Jiangsu. Is it necessary to wear down jacket?

Look at the weather in Beijing. I went to the Great Wall yesterday. It's sunny. The temperature is 20 degrees. Just wear a long-sleeved shirt and coat outside. You should bring a handkerchief or a tissue. It's windy When you sweat, you have a headache. Wipe it off immediately. I went to the Forbidden City the day before yesterday. It's cloudy and the breeze is a little cold. It rained in Beijing today. I'm wearing a down jacket, and it's cold. It will get hotter and hotter by the end of the month.