When Do New Skins Go On Sale?

They stopped putting skins on sale for the first week they came out. But instead they have 4 instead of 3 champs and skins for sale multiple times a week. So if I had to guess when these skins will go on sale either Christmas for next year.

I never read anything of that nature. I know that when they first started doing this about 3 months later they put on sale most of the stuff that wasn't on sale on release day to make up for it. They might do that again. Maybe in August or November.