I'm Planning to go to Siberia in December, taking my cameras there would they work in -20C -30C?

I'm Planning to go to Siberia in December, taking my cameras there would they work in -20C -30C?
Edit
Nikon D5300 and Gopro 5 Black are the main two.

I would not take them out in wet / rain conditions… Just when it dry but cold?

would they work? I would take care of the condensation and battery

There should be recommended operating temperatures in the specifications.