I actually don’t. I have an acquaintance who skis through the summer months, but I don’t know if he has a streak going. If I lived in Squamish or Pemberton, I’m sure I would know more than a few.
There’s certainly no shortage of snow! However, since the mountains in the southwest BC are relatively low in elevation, the snowpack often becomes isothermal sometime in May due to a lack of a nighttime freeze.
The volcanoes are much more attractive by comparison with their colder nighttime temps at elevation and easy access.