No night, no weather change on our mighty Castell but it would more interesting that the day-night cicle will resemble the country chosen and as long as GPS is activate (or a city chosen into the game as reference) the weather would change accordingly.
Daylight and nightime are also useful for cycardians cycle (blue light keep people alert and awake) and contrast with outside illumination.
Wouldn’t beautiful having a real time real weather synced castel scenario? Then the second step would be to offer cartel skins for buying in five kind of {blue, humans}, {red, dragons}, {green, helves}, {yellow, gold darfs}, {violet, gothic vampires}. I such a way, development would be paid by those would be the skins scenario.