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Precipitation and ETo for East Tracy, CA <br />*** Estimated <br />*Ave. Eto *Ave. Precip.Deep Perc. <br />Month (in/mo)(in/mo)(in/mo) <br />Jan 1.24 1.90 0.66 <br />Feb 1.96 1.72 <br />Mar 3.41 1.37 <br />Apr 5.10 0.84 <br />May 6.82 0.45 <br />Jun 7.80 0.09 <br />Jul 8.06 0.03 <br />Aug 7.13 0.09 <br />Sep 5.40 0.22 <br />Oct 3.72 0.52 <br />Nov 1.80 1.10 <br />Dec 0.93 1.55 0.62 <br />Sum:53.37 in/yr 9.88 in/yr 1.28 in/yr <br />*Source: California Irrigation Management Information Systems (Zone 12) <br />(www.cimis.water.ca.gov) <br />**Source: Western Regional Climate Center (Station 048999) March 1906 to May 2016 <br />(http://www.wrcc.dri.edu/) <br />***Assumption: If monthly precipitation exceeds potential ET then <br />the difference is potential deep percolation. <br />Plate 7