GP is talking about winter sunlight, not year-round numbers. (Longer summer days don't help seasonal affective disorder.) Stockholm sees about 6 hours of daylight at winter solstice, while Seattle sees 8.25.
And Seattle is sort of cherry-picked -- it's one of the northern-most cities in the continental US, representing 1.2% of the US population (including the full metro area). LA sees 9.75 hours of daylight on the solstice. Honolulu sees 10.75 hours.
The US population-weighted centroid is approximately Missouri[1], which sees 9.5 hours of daylight on the solstice -- more than 50% more than Stockholm.
