Why is it always raining?

I've noticed this as well while watching some youtubers let's plays. Specifically Vixella's Barbie legacy. She keeps moving to different towns and it just keeps raining.

Windenburg is another one of those worlds where it's almost always raining, but very little in the way of thunderstorms. I don't play much in the other worlds anymore. I turn the thunderstorms off, but keep the rain, and snow just for the season effect. It's spring in my game so there's lots of rain and sometimes snow, but not enough to cause a snow day.