Yep, he's still dead. Even checking whether he has a temperature will not bring him back. Though of course, there's nothing to say that this isn't the start of Melisandre bringing him back to life, of course (it's probably not). It's much more likely that Snow will actually spend most of the season "dead" before something happens or is revealed at the end to suggest there is hope for his resurrection. I wouldn't be entirely surprised if Melisandre realises she has to combine her powers with those of Thoros (who surely HAS to come back at some point?)