Something else I noticed while living in Seattle. Compared to the US East coast and much of the mid-west it's FAR less muggy year-round in spite of constant overcast, rain, or mist for most of the year.

I remember flying from Seattle to London a few years back and was surprised that in spite of the same weather, London was almost unbearably muggy -- it felt like I stepped into a swimming pool my skin felt so moist.