Does Panzhihua, Sichuan wear cotton-padded jacket in winter?

I'm from Panzhihua ~ I don't need to bring a cotton-padded jacket ~ It's more than 20 degrees in most days in winter ~ It will be cold if it rains occasionally, and I can get a sweater at most ~ People with good physique don't even need to wear a sweater. Really. The annual average temperature is above 20 degrees. It's sunny most of the time. It's just that the air is dry in winter.