Bob,
I would guess high 30 low 40 lakes been making skim ice on cold nights. As far as the waders go I couldn't swim in them. It was a good decision as i was losing motor function in my limbs fast. I passed the waders back and forth between my arms as they got tired. I must thank bear grilles as I watch one of his programs about surviving in cold water, I kept my head, fucused on my goal. Once my arms stopped working I was still able to hug the waders and kick with my feet, thats why I said they saved my life other wise I wouldn't have made it and drown 100 yards for the shore.
Dean