The coldest dunking that I took was on the Kalama back around 71. My Dad and I were fishing the lower river and I deceided to move down to the tail out. I had to cross over some ice that I had one over on the last outting. It ended up being deeper then I remembered. Dad started the car to warm me up. It did little good and he was not ready to go due to the bite being on. I was so cold that when I went to bed that night I was still cold.