Sorry, no data for those. I would really like to get some, particularly for Chillan.
The weather pattern in Northen Andes is very diferent from southern Andes.
Some seasons the south gets all the good stuff, and others the north... but Chillan appears to get a "mix" of both patterns...
Well, as I said, I'm not a specialist but I think Chillan gets definitively one of the most reliable snow in the Andes.
If I had to plan a ski trip in advance, my bet would be Chillan in August.