It's not that cold...

The expected water temperature is approximately 55 degrees, which is by no means warm, but it's not "I'm going to die from hypothermia" cold either (if properly equipped). With a full sleeve wetsuit, a neoprene cap, and an over abundance of adrenalin, I expect only my hands and feet to go numb (within a good two minutes of hitting the water). Now I realize that I only have a sleeveless wetsuit, perhaps I need to look into borrowing one...