Welcome to the forum and to Washington State. We're up close to the top LH corner. Where will you guys be?
You'll certainly see a big difference from AZ. Webs grow between your toes and 60F and 50% humidity is a nice summer day!.
Actually this year has been spectacular. We had (I think) 79 days in Anacortes with less than 0.2" TOTAL rainfall, and clear skies, sunshine, temps in the mid-70s and humidity in the 20% range. It changed with a bang on Friday. We're now into daytime highs in the 50s, humidity in the 80% range, wind and rain - a normal NW winter. There's already 4 to 8 inches of snow in the mountain passes, particularly US2 and SR20. I-90 doesn't seem to have been affected much as the snow level is just about at the highest level of the highway.
Whatever brings you and family here, I'm sure you'll grow to love the place. We emigrated from the UK in 1968 and have lived in Western Washington the whole time, except for a short stay in Tidewater Virginia. I'd never seen a combination of fog, thunder and 85F at 07:00 in my life before we moved there. Endured it for a bit over 2 years and then got back to Washington - been here ever since.
Frank and Eileen
No longer RVers or FR owners