What should I wear to Daocheng Aden Seda in mid-July?

On 20 17. 7. 30, I walked from Luo Rong Cattle Farm (4 180m above sea level) in Daocheng Aden Scenic Area to Milk Sea (4600m above sea level) and Wuse Sea (4700m above sea level) and took photos of tourists' clothes (about 4500m). I still have to wear a thin down jacket or wool jacket.

Attachment: The Yangmaiyong Snow Mountain I photographed on the Wuse seawall dam was still sunny at 2: 30 in the afternoon.