0 atm implies no gas present, so classically it couldn't have a temperature.
It would have the temperature of the surrounding pressure vessel but that might not be a useful definition.
Interesting. However... at 0 pressure, there may be 0 temperature, which could theoretically exist,though it would cause all materials around to freeze due to diffusion. This might cause the Universe to freeze, though.
oh, btw, I am an amerature at this i don't really know what I am talking about.