That's primarily why people tolerate Seattle's climate. 9 months out of the year it will often be grey and rainy, but the natural wilderness is phenomenal exactly because of that. If you're into the outdoors, backpacking, fishing, kayaking, canoeing, mountain biking, trail running, skiing, rock climbing, there's tons of stuff within an hour drive of the city. If you get out backpacking and chat with other people you meet on the trails, it's a pretty common refrain that they moved here in large part for the outdoors.
And then when July - Sept rolls around and it's consistently warm and sunny -- you can't beat it!
Personally, the grey rainy weather was never really off putting for me. But that's probably because I was born here and I'm used to it. It's like that Bane quote from Batman: "Ah you think darkness is your ally? You merely adopted the dark. I was born in it, molded by it. I didn't see the light until I was already a man, by then it was nothing to me but blinding!"