Whistlers snow cover is fairly minimal. I was just there last weekend. Lifts open were Harmony, T-bars, Emerald and Franz's. Of Course Gondola too. Peak chair was closed. Snow cover real low at base of harmony and Emerald. It did snow 6 inches or so on Monday.
I skied Whistler on Monday - it was much colder than on a weekend and it was snowing!
There were not many people, so there was a lot of powder everywhere (not very deep though, about an ankle high in average). It was one of the best day for me ( I ski Tahoe and we do not have good light powder there). Unfortunately, the Harmony was closed, so we skied Emerald and Franz.
It was a big surprise for us, since we wouldn't expect this kind of conditions at the end of May.