In one of the biggest fjords, the "Icefjord":
One of the float-piers:
This is summer season, normally from june to say september. I'm not planning on going out during the fall, or storm season, but I've only been here for three weeks and planning on living here for two-three years so I haven't experienced all the seasons yet. Will fly home for christmas and a three week vacation but thats it. Winter is a no go either way though, we're talkin -35C temperatures then. Boat owners up here normally store their boats from september, and roll them out again in june. Winter is snowsled/husky time, dark 24/7 and watching out for polar bears.
I love your idea of taking on the northwest passage. It would be a great adventure and as you say, it opens up more and more due to the global warming. We also see results from global warming up here.