I was also going to mention the Portland area of Oregon - actually the whole Willamette Valley is very nice. Some areas east of Portland on the Columbia River do get some of the worst of the cold weather we get in the area - and that is mostly a bid deal because we so rarely have to deal with any noticable amount of snow (as Alice28 mentioned, it usually melts quickly).
There is a lot of rain but less than some areas get that people don't think of as rainy. Of course, in those places the rain comes in heavy storms that dump a lot of water and move on while in this area the annual rainfall is spread out over more of the year. The nice thing about that is it keeps things green so we haven't had any forest fires to worry about in decades. This also means that the ecosystem had adapted to dealing with water so flooding is usually only an issue close to rivers and creeks. Even then it is nothing like the midwest sees.
As for heat in summer, we usually don't see really high (upper 90s and over) until late July or early August and they usually end in early September. We don't, though, have the high humidity so many other places (like WDW) get with that heat so it's usually not too bad. For the WDW trip my DD and I took in September, I thought I'd be OK with the heat as we were just getting over our high temps for the summer. However, I had not anticipated just how much the humidty would affect the perceived temperature. We have days here that some might call humid but it was nothing compared to what I felt in WDW.
Now, for those who may wonder, cost of living is higher in the Valley than in other areas of Oregon because of an influx of people moving from other states, mostly California and Washington. Again, though, it's not bad when you look at many parts of the US.