Actually, Seattle receives less rain than almost any of the cities on the Eastern Seaboard of the U.S. (only about 36 inches yearly compared to say, 45 inches yearly in New York City). As toughguy said, the rainfall is just more drawn out.
Here's the list of the wettest cities according to a random web site:
[SIZE=3]10 wettest cities[/SIZE] [SIZE=1]
Avg annual precipitation in inches[/SIZE]
[SIZE=2]
1. Hilo, Hawaii[/SIZE] [SIZE=2]128.00[/SIZE] [SIZE=2]
2. Quillayute, Washington[/SIZE] [SIZE=2]104.50[/SIZE] [SIZE=2]
3. Astoria, Oregon[/SIZE] [SIZE=2]69.60[/SIZE] [SIZE=2]
4. Blue Canyon, California[/SIZE] [SIZE=2]67.87[/SIZE] [SIZE=2]
5. Mobile, Alabama[/SIZE] [SIZE=2]64.64[/SIZE] [SIZE=2]
6. Tallahassee, Florida[/SIZE] [SIZE=2]64.59[/SIZE] [SIZE=2]
7. Pensacola, Florida[/SIZE] [SIZE=2]61.16[/SIZE] [SIZE=2]
8. New Orleans, Louisiana[/SIZE] [SIZE=2]59.74[/SIZE] [SIZE=2]
9. W Palm Beach, Florida[/SIZE] [SIZE=2]59.72[/SIZE] [SIZE=2]
10. Miami, Florida[/SIZE] [SIZE=2]59.55[/SIZE]
[SIZE=2]Chart data sources: The National Climatic Data Center, Riskmeter Online, Hurricane City, Weatherpages.com,
National Lung Association[/SIZE]
Oops, the table didn't copy properly, but you get the idea.