Yeah he probably is, but he can't just weave a parka. You gotta put up with whatever in life, like being brought back from the dead in an ice world. It happens all the time. Just have to work with what you're given.
isn't it more weird that they can shoot fire balls out of their mouths and do do all kinds of elemental powers? a shirtless obito in snow is hardly an issue compared to what the narutoverse can truly do.