I live in a northern climate. Maybe I'm an anomaly.
Just for the sake of benefit of other views who happen on this thread. Another thing to consider that ties in with optimal health along with exposing skin to sunlight is sungazing I highly recommend people do this. Read up on it to do it properly.
One more thing is to walk barefoot on ground as much as possible to ground. This actually helps charge cells with earth electricity. (that's the short explanation).