How many sunny days do you have in your neck of the woods? I used to have a teacher from California who complained that our winters were all cloudy days. That made me notice all of the cloudy days, rather than the sunny days. I used to think we in Wilton, CT 06897 had only about 20 days all year without sun. I found out I was wrong.
I wonder what this chart would look like in Arizona? or California? or Maine? or Seattle?
I love the sun, and therefore I think if it peeks out, I consider it a sunny day.