The Puget Sound basin is a mixture of low rolling hills combined with a complex maze of sheltered inland salt water and has a mild climate characterized by wintertime clouds and rain but lots of summertime sunshine. Most of the population of the state of Washington has chosen to live here. The northern end of this region (around Bellingham) is unique in that it occasionally gets blasts of cold arctic air and snow when the rest of the Puget Sound basin has cool but mild winter weather.

This climate data presentation is a subset of that provided by the Western Regional Climate Center.