California Temperatures (IMAGE) Desert Research Institute Caption This map, created using California Climate Tracker, shows mean temperature percentile rankings for different climatological regions in California during June -- August 2018. Credit Dan McEvoy, DRI. Usage Restrictions None License Licensed 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.