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i04 CIMIS Reference Evapotranspiration Zones v1999

The ETo Zones Map allows users to view the grass-reference evapotranspiration (ETo) Zones for the State of California. The map was developed by DWR and UC Davis in 1999 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 dataset is the version from 1999.

Data files

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CSV

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CSV
05/30/25

Shapefile

DownloadZIP
05/30/25

GeoJSON

DownloadGEOJSON
05/30/25

KML

DownloadKML
05/30/25

Supporting files

Data title and descriptionAccess dataFile detailsLast updated

ArcGIS Hub Dataset

HTML
05/30/25

ArcGIS GeoService

ARCGIS GEOSERVICES REST API
05/30/25

API endpoint

Dataset Name

Use the query web API to retrieve data with a set of basic parameters. Copy the API endpoint you need to start.

Usage documentation