User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-6050823-20140606010041/@comment-6050823-20140606022248

No, those areas always looked like that in MH4, though in one trailer we saw a thunderstorm along with rain in the Primeval Forest but I never saw it happen in-game ever.

The only real thing I somewhat consider night is the lighting in some areas and the Magaras since they make areas darker.