Spatial Maps

Select the calendar on the right to see daily ETo or Solar Radiation maps of California based on Spatial CIMIS data. To retrieve and schedule Spatial CIMIS data, please register, log in, and click on the Spatial Report or Schedule Spatial Report tabs above. Spatial data are available back to 2003.

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November 2022
Solar Radiation Map

Spatial CIMIS Solar Radiation maps are generated from remotely sensed satellite data from the Geostationary Operational Environmental Satellites (GOES) using the Heliosat-II model. See the Spatial Overview for more details.

ETo Map

Spatial CIMIS ETo Maps are generated by coupling remotely sensed satellite data from the Geostationary Operational Environmental Satellites (GOES) with interpolated CIMIS station data and using the standardized American Society of Civil Engineers Penman-Monteith equation to calculate ETo at 2-km spatial resolution. See the Spatial Overview tab above for more details.

ETo Zone Map

The ETo Zones Map allows users to view the reference evapotranspiration (ETo) Zones for the State of California. The map was developed by DWR and UC Davis and divides the State into 18 zones based on long-term monthly average ETo. The ETo values were calculated using data from various data sources including CIMIS weather stations that had at least five years of archived data. This map can also be viewed and/or downloaded as a PDF document using this link.

Spatial Map
Solar Radiation

This is a newly emerging technique and is in the process of being refined. Although the data quality presented here is acceptable for many applications, we do not guarantee its accuracy. Therefore, neither the CIMIS program, the Department of Water Resources (DWR), UC Davis, nor any other party who participated in the development of this product shall be responsible for errors in this data, nor for any resulting consequences from using this data.