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Ԁlɐɔǝqo
I just thought about something that could randomize MM a bit... If you know which stadiums you are going to be playing in, you could do this setting across all of them before starting manager mode so as to randomize it.
Say you set all Ivy Hall or whatever games to "overcast" - you should be able to play all of those games throughout MM as overcast... Do the same with whatever other stadiums. It would take some time but it's very doable.
As far as snow, you would guess that Germany would have snow games while England would have more rainy games...
Does this sound reasonable?
Sounds great in theory but I'm pretty sure it wouldn't work, I think it only sets the changes for the last stadium you changed in exhibition.