Is it legal to increase taxi fares in rainy and snowy days in Changsha County?

Taxis are not allowed to raise prices at will.

There is no document stipulating that taxis can raise prices at will in rainy and snowy weather. In the bad weather environment, the taxi price increase is the personal behavior of the taxi driver. The state expressly stipulates that taxi drivers are not allowed to raise prices privately for any reason. It is against state regulations for taxi drivers to raise prices privately. If you see such behavior, you can report it to him.