Should I really wear sunscreen every day...?

I don't know anyone at all in real life that does this, but I've been looking this up online and everyone seems to say that you should wear sunscreen every day... The only sun that I get daily is when I jog outside for half an hour at 7 in the morning. No one in my family uses sunscreen except when we're at the beach or when we're going to be outside in the sun all day, and we only use sunscreen during the summer since it's always raining in Washington. Should I start wearing sunscreen every day even though it seems like it'll have no effect at all??