Looking at the skybox, the clouds are morphing very quickly.
The issue is very noticeable on cloudy2, cloudy3, rain-medium, rain-spray, and rain-storm. It is slightly noticeable on fog.
It occurs every time I play, and it existed before the 6.0 experimental version, but the automatic weather and improved visuals have made it more obvious. The cloudy3 preset is particularly jarring.
I have no mods installed.
I am running version 0.6.1 (26276590)
This has been a thing since prior to the experimental update.
But I agree that the clouds should be less flamboyant than they are now. Rn they’re just kinda like weird gray lava lamps in the sky.
One thing that’s really cool is that the weather changes are localized; they move around the map. It can be raining in Whittier and sunny in Ela at the same time.
It’s a feature that I’ve never seen implemented in any other game (apart from Flight Simulator).
It would be good if cloud fronts were created that moved in a specific direction, bringing rain with them under those clouds as they pass over us.
The fog is great, but the changes are too rapid. I like the weather work in general; I hope it improves over time.
Perhaps we’ll have an annual calendar and future seasons?..
Agreed. The weather effects are really nice. But I also feel like they come and go too easily. Kinda neat the first few times to show it off, but then I look at it and say mostly weather stays similar most of the day or changes gradually. Fog coming and going multiple times a day doesn’t seem totally realistic.
This again might be a possibility of a slider to increase/decrease the probability of weather changing. I might set it pretty low and today will just be a rainy/foggy day ALL DAY. Hopefully tomorrow will be sunny. 
I noticed this also. But this has been a thing since i first started playing 2 years ago.
Loving the new dynamic weather, but the clouds in the sky move/change extremely fast. Would love to see a skybox that looks more realistic and doesn’t look so pixelated.