I live in the Inland Northwest, and I assure you what you mention is true. We have a forest, but generally the ground is brown and dry in summer, and the winters are long and hard. The Cascades are huge, and create an extensive rain shadow.

Seattle sits right next to the only temperate rainforest in the world, though. The sheer amount of plant life there is something to behold, and it doesn't get cold there all that long.