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Precipitation and ETo for Tracy, CA <br />** Estimated <br />*Ave. Eto *Ave. Precip.Deep Perc. <br />Month (in/mo)(in/mo)(in/mo) <br />Jan 1.47 1.65 0.18 <br />Feb 2.18 0.62 <br />Mar 3.93 0.78 <br />Apr 5.81 0.83 <br />May 7.88 0.14 <br />Jun 9.11 0.10 <br />Jul 9.06 0.00 <br />Aug 7.95 0.00 <br />Sep 6.07 0.27 <br />Oct 3.65 0.63 <br />Nov 2.01 1.15 <br />Dec 1.36 2.19 0.83 <br />Sum:60.48 in/yr 8.36 in/yr 1.01 in/yr <br />* Source: California Irrigation Management Information Systems <br />Station ID: 167 Tracy 2013-2017 (www.cimis.water.ca.gov) <br />** Assumption: If monthly precipitation exceeds potential ET <br /> then the difference is potential deep percolation.