Union City CIMIS statonCalifornia Irrigation Management Information System

The California Irrigation Management Information System (CIMIS) is a repository of climate data collected at more than 100 computerized weather stations located throughout California. CIMIS helps agricultural growers and turf managers administering parks, golf courses and other landscapes to develop water budgets for determining when to irrigate and how much water to apply. Providing information for improving water and energy management through efficient irrigation practices is the primary use of the CIMIS system.


CIMIS was developed by the California Department of Water Resources and the University of California at Davis. Operational since 1982, it is continually updated to employ the latest technology. Access to CIMIS is free and the system operates 24 hours a day, every day of the year except during maintenance hours. Data is accessible through the internet at the CIMIS website.

The ACWD & CIMIS Partnership

ACWD, the Department of Water Resources and Union City joined forces to install a station at Town Estates Park in Union City in 2000. Union City CIMIS Station Number 171 meets all the conditions needed to provide accurate weather information.

Need More Info?

For additional information about CIMIS or to learn how to use the station, go to the CIMIS website. To gain access to the information provided by CIMIS Station Number 171, click on the "CIMIS DATA" tab and register as a user. If you have questions about accessing the data or any other questions you can contact ACWD's Water Conservation Department at 510-668-4218 or via email.