What clothes are suitable for going to Tianchi Lake in Changbai Mountain now?

The highest elevation of Changbai Mountain in China can reach 269 1, which is the birthplace of the Three Rivers. The annual average temperature is between -7℃ and 3℃, and the average temperature in July is about 10℃, but the temperature in mountainous areas changes every day. I went to Changbai Mountain in the middle and late July of that year. The temperature was not high, but it was not very cold. After all, just wear short sleeves in summer and take long sleeves.