More ice means the waters will not warm as quickly from the summer sunlight. Saw an estimate that just when the ice is supposed to be mostly melted this summer, it will be time again to build ice. And that was at about 80-90 % coverage. At 100 % coverage it may never fully thaw this summer. That should mean less rain for the east, but we have some other complicating factors right now driving more rain overall.
One thing is for sure, the summer swimming season will be exceptionally brief.
CC