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Precipitation and ETo for Manteca, CA <br /> *** Estimated <br /> *Ave. Eto **Ave. Precip. Deep Perc. <br /> Month (in/mo) (in/mo in/moo <br /> Jan 1: Lbb 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 a99 in/yr <br /> *Source:California Irrigation ManagementlnformationSystems(Zone 12) <br /> (www.cimis.water.ca.go v) <br /> **Source: Western Regional Climate Center(Station 045303)1971 to 2000(http.//www.wrcc.dn.edu/) <br /> ***Assumption:Ifmonthlyprecipitation exceeds potential ETthen <br /> the difference is potential deep percolation. <br />