- You can run in 33 degree temperature water for hours, and possibly swim for even more.
So not wanting to jump the technical train but the water was 28 degrees.
Normal body temperature of course, is 98.6. Shivering and the sensation of cold can begin when the body temperature lowers to approximately 96.5. Amnesia can begin to set in at approximately 94, unconsciousness at 86 and death at approximately 79 degrees.