When will the cold air end?

It depends on where you are. If you are in the south, the cold air won't last long, but it usually warms up after spring. And cold air is usually cold for a while and not cold for a while. If you are in the north, it usually won't warm up until mid-March. Before Tomb-Sweeping Day, most parts of China were not very cold. If you feel cold, it is recommended to put on more clothes when you go out.