I have a pretty good idea of how cold that water was, my buddy shot a buck during late muzzleloader last year, he one lung/liver shot it, it ended up going into the some of the back waters of a huge lake, we sat on the bank looking at the deer trying to get up on the ice as only part of the water was covered for nearly an hour and a half, I am pretty sure the only thing that kept it alive was the cold water because the water surrounding the deer was completely red. So we waited for him to expire because you cannot shoot over open water, it was getting close to dark and there was supposed to be a big snow storm moving in that night. My buddy and I stripped down to our skibbies in 15 degree weather, thank god it was not windy, and walked/swam out to the buck who was about 50 yards off shore, at times sinking half way to our knees in the muck. I can tell you one thing, it was definately an eye opener and once we got out of the water, the mud on the embankment sure felt warm.