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100 Year Effective Average Effective 100 Year Average <br /> Month Days Precip Precip Precip Precip ET,, ETo <br /> in. in in. in in. in. <br /> Jan 31 5.13 3.02 2.75 1.24 0.90 1.06 <br /> Feb 28 4.37 2.42 2.18 0.87 1.73 1.86 <br /> Mar 31 2.85 1.30 1.76 0.62 3.38 3.53 <br /> Apr 30 1.53 0.49 0.97 0.21 5.04 4.99 <br /> May 31 1.38 0.41 0.58 0.06 6.45 6.73 <br /> Jun 30 0.24 0.00 0.12 0.00 7.54 7.56 <br /> Jul 31 0.05 0.00 0.02 0.00 8.02 7.98 <br /> Aug 31 0.08 0.00 0.03 0.00 7.11 7.08 <br /> Sep 30 0.28 0.00 0.14 0.00 5.19 5.23 <br /> Oct 31 1.17 0.30 0.68 0.09 3.33 3.39 <br /> Nov 30 2.14 0.84 1.29 0.36 1.60 1.66 <br /> Dec 31 2.61 1.14 2.05 0.79 0.86 1.01 <br /> 21.8 9.9 12.6 4.2 51.2 52.07 <br /> Average precipitation and evapotranspiration (ET)from 1987 to 2013 California Irrigation Management Information System (CIMIS) <br /> station 70 located in Manteca, CA <br />