Yes, that is a challenge! And I can just see you attempting exactly that - running around moving your plants in and out of the rain!!
Its funny how we often have to change our plant list based on where we've moved! As I've gotten into these cold hardy succulents, like Sempervivum and Sedums, than I've been happier with what I'm growing! Although I do have to provide summer part/shade, and winter full sun...easily acheived by cutting back bushes nearby in autumn and letting them grow back up through spring
Seattle in springtime is amazing though, with so much in bloom!