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F C) <br /> Table 5 . Estimated reference evapotranspiration (ETo) rates (inches/day) for regions <br /> of similar climates* <br /> F, <br /> Region Jan Feb Mar Apr Hay Jun Jul Aug Sep Oct Nov Dec <br /> ETo (inches/ ay) <br /> Northeast <br /> mtn, valleys 0 . 02 0 . 04 0 ,07 0 . 12 0. 16 0 . 20 0 . 25 0. 21 0. 15 0. 09 0 . 03 0 . 02 <br /> North coast <br /> interior <br /> valleys 0. 03 0. 05 0 , 08 0 . 11 0 . 16 0 . 20 0 . 21 0 .19 0 .15 0.09 0 .04 0 . 02 <br /> d Central coast <br /> coastal <br /> valleys 0 . 06 0 . 08 0.1.0 0 . 14 0 . 16 0 . 18 0. 15 0 . 18 0. 15 0 .11 0 . 06 0 . 06 <br /> Central coast <br /> interior <br /> valleys 0.05 0 . 07 0 . 11 0. 15 0.18 0, 18 0 . 21 0 . 20 0 . 17 0 . 12 0 . 07 0. 05fit ' <br /> South coast <br /> interior <br /> valleys 0 . 07 0.09 0 . 11 0 . 15 0 . 17 0 , 20 0 .22 0.20 0 . 16 0 . 13 0 . 09 0 . 06. <br /> South coast <br /> coastal valleys <br /> # and plains 0 . 07 0.09 0. 10 . 0 . 12 0 . 14 0 . 15 0 .17 0 , 15 0 . 13 0 . 11 0 , 08 0. 06 <br /> Sacramento <br /> valley 0 . 03 0 . 07 0 . 11 0. 16 0 .20 0. 25 0 . 26 0. 23 0.18 0 , 13 0 . 06 0 . 03 <br /> San Joaquin <br /> valley 0. 03 0 . 06 0 . 11 0 . 16 0 .21 0.26 0 . 27 0,23 0 . 18 0 . 11 0 . 05 0 . 02 <br /> Southeastern <br /> desert 0.09 0 . 13 0 . 19 0 . 27 0 . 33 0 . 38 0 .38 0 . 32 0 . 28 0 . 20 0 . 12 0.07 <br /> *Actual ETo rates are variable within each region and can be adjusted upward or <br /> downward depending on the local climate relative to average for the region. A monthly <br /> ETo rate more than 10 percent above or below these given would be unusual . <br /> r- <br /> 18 <br />