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Precipitation and ETo for Manteca, CA <br /> <br /> <br /> <br /> *** Estimated <br /> *Ave. Eto **Ave. Precip. Deep Perc. <br />Month (in/mo) (in/mo) (in/mo) <br />Jan 1.24 1.65 0.41 <br />Feb 1.96 1.35 <br />Mar 3.41 1.52 <br />Apr 5.10 0.95 <br />May 6.82 0.21 <br />Jun 7.80 0.09 <br />Jul 8.06 0.12 <br />Aug 7.13 0.23 <br />Sep 5.40 0.24 <br />Oct 3.72 0.97 <br />Nov 1.80 1.58 <br />Dec 0.93 1.51 0.58 <br />Sum: 53.37 in/yr 10.41 in/yr 0.99 in/yr <br /> <br /> <br /> <br />* Source: California Irrigation Management Information Systems (Zone 12) <br />(www.cimis.water.ca.gov) <br />** Source: Western Regional Climate Center (Station 045303) 1971 to 2000 (http://www.wrcc.dri.edu/) <br />*** Assumption: If monthly precipitation exceeds potential ET then <br />the difference is potential deep percolation. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />