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The approximate method to estimate potential evapotranspiration using monthly mean temperature Haruki NUMAJIRI Abstract The purpose of this study is to develop an easier method than Thornthwaite's to estimate the potential evapotranspiration. The data used are monthly climate (temperature) grid data of 1km resolution (Japan Meteorogical Agency). We calculated potential evapotranspiration by the Thornthwaite's method at first. We got an approximate expression as follows, verifying bydoi:10.4145/jahs.36.71 fatcat:ygx2ltvi4fcibn4ei3okq2t2cm