[buwaya]

I make it 12-15 degrees Celsius according to Euroweather -

Or about 54-59 F

http://www.eurometeo.com/english/sst

It doesn’t seem that cold, but even that temperature will cause death by hypothermia for many people over a couple of hours, and will probably disable them much sooner than that, particularly the elderly.

[Mich Patriot]

Yeah, someone else wrote about 57F. That’s VERY cold, as the effect of water on body temp is dramatically different than air. It’s a good thing it wasn’t very far for the ones who jumped/swam.