Unless you are albino (which is a large set of other problems) being in the sun all day will develop enough of a tan that you won't sunburn. There might be a problem in spring, but by summer time most people will have spent enough time outdoors that they wouldn't sunburn. I've always been the lightest person in town (a tie in Stockholm) and I can spend all day outside without any sunscreen and I won't burn on the parts of my body normally not covered (my arms), but other parts would burn in a few minutes (If I took off my hat or shirt...)
As someone from Britain with Scottish ancestry I don’t really tan at all. The melanin in my skin clumps in freckles, severely limiting its effectiveness at blocking UV. I can spend time outside in a t-shirt during the long summer evenings in Britain/Scandinavia but will burn during the midday sun. Living in California now the sun is stronger for longer so I just cover up.
San Francisco is at a southern European latitude. It’s a lot worse in the tropics.
I don’t think this is correct, Black people still get sunburns
I don't know about that. I'm a fairly tanned individual, but where I live, in Texas, if I spend all day in the sun, I'm getting sunburned bad everywhere.
Fascinating. Now come and try that on the Arabian peninsula and see how you get on
It's bizarre that you cite being outside at 60 degrees latitude as evidence related to high UV exposure.
That's like a resident of Porto saying most people don't get frostbite walking around outside in winter...