It's just called wilderness, looks beautiful, arguably more deadly.
Parks in AZ on the border of Phoenix(for example) don't have notices that cars left in the lot will have immediate search and rescue operations started to find them at dusk. Parks on the northern edge of Vancouver do.
You can have that weather in northern Arizona though.
The closest thing we've had in a game to the temperate rainforests of the pacific northwest that a lot of the cowboys of the region had to fave would be the thick tropical jungles of Crysis and Far Cry.