Bitch bitch bitch. I went to High School in Ithaca NY. The sources I can find that have data for both cities put them pretty close. BestPlaces says Seattle has 152 sunny days, and Ithaca has 154 sunny days. HomeFacts says Seattle has 56 clear days, and Ithaca has 53 clear days. They're pretty comparable, but Ithaca has a lot more snow. I think I'd handle Seattle's climate fine.
I remember a math teacher once stopping class to bring our attention to a patch of blue sky that had temporarily appeared. I don't think people were particularly depressed.