I did the trip from Lake Michigan tp NYC via the Gulf of St. Lawrence a half dozen years ago.
The Toronto to NYC part took about 17 days. It was spectacular - Northern Lights every night and the St. Lawrence near the mouth is a world unto itself. Itty bitty fishing hamlets and great French Food.
You betcha - we did the trip in mid-August and wore wool caps and foulies. The mouth of the St. Lawrence is surprisingly far north. But the locals wore shorts and flip flops - they thought it was the height of Summer and blazing hot.
The Gulf of St. Lawrence has a reporting and tracking system for ice floes and bergs. We didn't need it. But I recall being schocked at how early the ice floe season started.
Last edited by WDS123; 09-28-2011 at 10:40 PM.