How about Ji 'an, Jiangxi?

Ji 'an is a little cold in winter, and the provinces in the central region are the coldest in winter. Because the lowest temperature will be around 0 or 2 degrees, but unlike some northern provinces, there is no heating. The air in Ji 'an is very fresh and the air quality is very high. There is no heavy industry, so the sky is blue. The natural scenery is good, such as Jinggangshan, and many counties and cities also have some less famous mountains with good scenery. However, Ji 'an's urban construction is worse than other places, its economy is not very developed, and it doesn't look like a big city.