40F = 4C
You had better be careful, 40F (4C) water exposure will kill you in a short period of time. I find it shocking that you can get in, swim, and dive in water that is close to the freezing temperature!
In florida we have fresh water springs that are 72F (22C) all year, and I had to pull a girl up from the bottom of Troy Spring who had drowned due to hypothermia.
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