I suppose that this weather can be an option too, but it will be good only if we see different seasons in the game (for the reason of snow appearing in the game). As for a fog, it would make sense at any point in time. However, I do hope that the weather will be random and not always follow the same pattern, so this can make it very interesting, especially if we see many different kinds of weather effects that occur in the game.

I read the new Game Informer's title game PROTOTYPE will feature tons of lighting, weather variety for each day during a two week cycle that repeats into infinity during the game's open city, New York open world gameplay, where you take the role of a genetic 'freak' with super abilities, including flying aircraft, copters, climbing buildings, etc.