This is the best way to look at it. I live in a hot sunny city that technically gets more rainfall than Seattle. But we’re also in a drought and when it does rain it’s a lot at once that mostly runs off. For example a couple weeks ago my house got over 4” of rain in less than an hour but now I’m right back to strict water usage rules in terms of landscape watering cycles, etc. I tend to think of Seattle as moist. I’ve spent a grand total of about 2 weeks there but even in middle of summer when I go on a hike I can tell the soil contains some moisture and has been wet recently. I’m sure it helps that the big trees and shade help slow down evaporation.