I moved to the Seattle area from South Florida in September when I joined Microsoft.

I haved traveled here a lot over the last 5 years. Overall the place actually gets just over half the rain that Florida gets and less than Washington DC, Boston and many other places.

Here are some numbers that I found...

City Seattle, WA Miami, FL
Annual Precipitation Average 36 inches 60 inches
Days with Precipitation 153 131
Clear Days 71 76

Seattle seems to have a reputation for rain because it has a long rainy season. The rain I have seen tends to be more constant but produces less rain than I am used to. I consider most of it drizzle. Florida is more prone to sudden, violent storms that produce a lot of rain in a short period of time but then move on quickly. The first 3 weeks I was here in September & October I did not see a drop.

It also does not get very (relatively) cold or hot, I saw snow here on one trip but locals tell me that occurs, at most, a few times a season.