The start of the season looks like it will be great thanks to a couple of big dumps, one a week or two ago, and one over the last few days which is still going.
In the last couple of years I would've said August as the early season snow hasn't been great, although generally things are looking up by August. This season I think you should be fine whenever, it looks like it should be a great season from the get-go. Cardrona has had something like half its average annual snowfall already before its even opened! Just avoid going mid July during school holidays.
Kind of a lottery as to whether you get any decent pow days though. Fingers crossed.