Free Online Databases


Evapotranspiration Data


This site contains monthly evapotranspiration data for both water balances and irrigation scheduling.  Information is downloadable by California ETo Zone

Online Weather Data


Both archived and real-time precipitation data from the official Cal Poly weather station is now available for download.

Irrigation Evaluation Data


This data is based on years of irrigation system evaluations throughout California, compiled in downloadable spreadsheets for six types of irrigation systems.