This page supplies both typical and historical weather data for 127 California weather stations. The typical year weather files update the CZ2010 reference files for each of 86 Integrated Surface Database (ISD) weather stations, plus 41 additions. 119 of the typical year weather files labelled as TYP12 are based on data from 12 recent calendar years (2006 to 2017), while 8 labelled as TYP4-TYP11 are based on a subset of those years. Weather station data are from the Integrated Surface Database maintained by the National Center for Environmental Information (NCEI). Solar radiation data originates from the National Solar Radiation Database (NSRDB) maintained by the National Renewable Energy Laboratory. For detailed information, including file naming conventions, formats, and data processing procedures, refer to: Update of California Weather Files for Use in Utility Energy Efficiency Programs and Building Energy Standard Compliance Calculations, CALMAC Study ID PGE0450.00.