User blog comment:Hulk10/Daenerys's fate/@comment-1600847-20160530121009/@comment-1600847-20160530124129

That's never been made clear if dragons are cold-blooded or can generate their own heat since they're "fire made flesh". The closest thing was when Alysanne Targaryen flew her dragon Silverwing to the Wall, it didn't seem to bother it but GRRM didn't go into detail.