Firstly, welcome to China! :)
May I ask where are you going? For some regions in China, A -9 C day from weather report does not mean it will be that cold all day. If it is -9 C at the coldest moment of a day, which is likely before sunrise, it can be 0+ during daytime, when it should be fine for you to take pictures.
The low temperature could affect the battery and the SD card. If you have to take pictures under extreme condition, remember to keep your camera at a warmer place, for example close to your body (cover it under your coat) or in a bag where you can put a bottle of hot water etc. When you see some nice scenes, take your camera out, quickly snap and put it back in. I would suggest you pre-set the mode so that you can do this as quickly as you can.
Another head up is that be extra careful when you bring your camera from outdoor to indoor or the other way around. The steam caused by temperature gap could hurt your lens. So you really need to keep it as warm as possible when you are outdoor.