I live in central Texas where summer temps often reach triple digits. Every summer the cold water gets warm. A few years ago when we had an exceptionally hot summer with temps aroud 110 degrees that lasted for a couple of weeks, the cold water got warm enough that I could take a comfortable shower without using any "hot" water at all.
Does this happen everywhere where the summers are this hot?
Why does it happen? Is it that the pipes aren't buried deep enough?
Just curious. Thanks in advance.