CalHeatScore Historical Data Archive
This webpage serves as the data archive for historical CalHeatScore data. The archive is organized by year, with the data for each year accessible by clicking on the corresponding year folder. Annual and monthly data files are provided in the archive, and the monthly data files are updated with the current day's scores at 8pm Pacific Time each day. The data was last updated 05/21/2026. The readme for the data provided is included in this directory. Navigate back to the CalHeatScore website.