I've been taking cold showers for about a month just because it's been extra hot and humid where I'm from (Singapore), and I've actually been really enjoying it. My water isn't 3 degrees C though, probably more like... 20. I wish I could have it colder.
I recently moved to Singapore and assumed cold showers were pretty much the norm here. Can confirm it's not comparable to having a cold shower elsewhere though, in terms of willpower :)
Perhaps a river or lake can provide you with colder temperatures? I've got a similar issue, I practice outdoor swimming the year round and the temperature doesn't get below 4 degrees. I've got to move countries to swim in colder water
I'm not sure a 20 degree shower really counts as a cold shower. That is a comfortable swimming temperature on most summer days and people can easily spend 20-30 minutes in water just to cool off even if they are unaccustomed to taking cold showers at home.
I've only been to such hot countries on vacation, and I think if asked, most people would confirm that they mostly don't use the hot water, except perhaps to sanitize hands with soap.
