Washington Climate Zones (IMAGE) University of Washington Caption The study looked at mortality data in 10 federally defined climatic zones for Washington state, shown here, from 1980 to 2018. Heat-related mortality risks were higher in four climate zones: the Puget Sound lowlands (fuchsia); east slope Cascades (mossy green); the Northeast Olympic San Juan (sea green); and Northeastern (teal). Credit Arnold et al./Atmosphere Usage Restrictions With credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.