I had this thought a week or so ago just thinking about pony stuff. The question was, why have winter if the seasons are manual? I mean, wouldn’t you just have spring, summer, fall, spring again? Maybe with a day or week of snow here and there for variety. So I was thinking about it and came to this thought: Winter is when the weather factory gets vacation. The snow is where the weather industry stores all the water and all the weather employees get to take time off. If we consider that, in general, the evaporate/cloud/rain cycle is more or less a manual thing. Maybe not the evaporation, but collecting it in clouds and distributing it as rain again could be. The yearly water collection from a town is obviously just making up for all the water that gets lost across the borders of the kingdom, or just plain inefficiency in the process.
So, winter wrap-up is the weather industry’s off season.