Humidex Mortality Curves (IMAGE) University of Washington Caption These graphs show how mortality odds change with increasing humidex for each of the 10 Washington climate zones. Four climate zones (highlighted) had statistically significant higher odds of mortality with increasing humidex. Other climate zones didn’t necessarily lack risk, but lacked enough data to produce a statistically certain trend. 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.