This page supplies both typical (most representative of a span of years) and historical (single year) weather data for 86-127 and 127 California weather stations, respectively.
Typical Weather Files: Three different typical year weather files are presented, each representing a different span of years.
- CZ2010 typical year files span 1998 through 2009 (a 12 year period of record) and were the standard weather files adopted by the California Energy Commission for Title 24 compliance calculations from 2010 through 2022. Read More
- CZ2018 typical year files span 2006 through 2017 (a 12 year period of record) and represents a more recent 12 year span of time than CZ2010. Read More
- CZ2022 typical year files span 1998 through 2017 (a 20 year period of record) and were adopted by the California Energy Commission for Title 24 Version 2022. Read More
Historical Weather Files: The historical weather data is presented by year, starting with 2014 for 131 locations, of which 122 have data for all 8 years. Current year data is updated daily. Read More
Sources: Weather station data are from the Integrated Surface Database and the National Solar Radiation Database. Read More
CAUTION: For current year weather files, there is usually a time lag of 2 to 10 days before the raw weather data becomes available. Be aware that the weather files are always presented as complete years so that they can be used in building simulation programs such as eQUEST. Data points beyond the retrieval date are filled with repeated values from the latest available data and identified with an "R" (Repeated) flag in the FIN4 format files. These values should never be used in any calculations. Users are advised to read the User Guide.
Click here for User Guide describing the CALMAC weather files in more detail
*Last update: 2024-02-26 01:33:51