windapp
Contributor
I have seen many posts on this website with people claiming they dove in 33-38 degree fahrenheight (0.5-3.3 degrees celcius) water in a lake or quarry in the middle of the summer. I would like to point out that this is impossible. Water reaches its maximum density at 4 degrees celcius (39.2 degrees fahrenheight), and if there was something at depth to make it colder (which there isn't), it would simply rise to the surface, and warm up. In the winter time, water below 4 degrees celcius rises and freezes, and water at 4 degrees celcius sinks to the bottom. This is why the water very deep in a freshwater quarry or lake is exactly 4 degrees year round, and can never be any colder.