Mild climate; few houses have air-conditioning. It's beautiful in the summer and dark, grim and gray in winter: we can go months without seeing the sun. People often move away because they can't face another Seattle winter.
It rains here -- had you heard? Actually, it mists, spits, drips, drizzles, rains, driving rains, showers, pours, downpours (all modifiable with "light" and "heavy") -- with unpleasant winter variants such as freezing rain and freezing fog. In summer the rain is warm. In winter it is not. Running for cover in anything less than driving rain marks you as a Californian (this is a Bad Thing) -- so does a tan. You are allowed to walk fast in rain if you are not wearing a rain parka. In mist you are expected to turn your face up to the sky and smile.
Seattleites buy the most sunglasses per capita in the world. That's because they as soon as they lose them, Yellow Face comes out again to blind them. The best sunglasses to have are Polaroid; they reduce reflections from wet roadways.
Only foreigners use umbrellas. Seattleites wear rain parkas. It is acceptable to wear a rain parka over a suit. If it's raining or more, you can use the hood.
In Seattle, if you're not prepared to do it in the rain, you're not going to do it at all. Except for tanning (see above). The driest part of the year is the last weekend in July to the first weekend in August.
Sometimes it snows here. I think it snowed year before last. The snow doesn't stay more than a day but stops everything when it comes.