What is CIMIS?
CIMIS is an acronym for California Irrigation Management Information System, a program unit in the Office of Water Use Efficiency (OWUE), Department of Water Resources (DWR). CIMIS is an integrated network of over 125 automated active weather stations located throughout California. Historical data is also available from an additional 61 inactive weather stations. These are weather stations that have been disconnected from the CIMIS network for various reasons. The numbers of active and inactive stations change with time as new stations are installed and existing stations disconnected.
CIMIS stands for C alifornia I rrigation M anagement I nformation S ystem. It is a network of standardized weather stations scattered throughout California which report weather data on an hourly basis. More importantly, the weather stations use this data to calculate ETo , which is a reference point for evaporative demand for that micro-region.
