That's not my experience either, both pre- and post-upgrade. I can only figure it's not only a matter of seed or rng, but perception is at work too...

Moreover, the 10th world is meant to be a purgatory, and like how storms there look extra-mundane, or how fog and mild rain can make feel how everything is getting wet in the outside. This is how I perceive it, but I figure that devs can still tweak weather settings a bit to your liking.

It could be worse, it could be a hellish weather.