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The EToZones 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. As such, it has great significance in the planning and design of various projects. The ETo values were calculated using data from CIMIS weather stations that had at least five years of archived data at the time and other data sources. This map can also be viewed and/or downloaded as a PDF document using the link at the bottom of the page.
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