Took a break from work today at 4pm to canoe on the city pond today. It was 36 F when I started and about 30 when I finished about 5:30pm.
1) Boat froze to grass while I was emptying it of gear, sponging out water and wiping down hull. First time for that.
2) Straps on mukluks didn't loosen up too easily because they had gotten wet and were frozen stiff. This could be a bit of a safety issue if they fill up with water and you can't get them off. I hadn't thought about the mukluk straps freezing, though I've had frozen tie down straps on the boat on the car top several times.
3) Ice covered gunwales slide on to rack more easily than usual.
I usually don't paddle in below freezing temperatures.