Hi,Has anybody worked with thornthwaite method to calculate the daily evapotranspiration ? I have used the following code to calculate monthly evaporation but what I need is daily evapotranspiration. Epot <- thornthwaite(Tave, lat, na.rm = FALSE) # Evaluates evapotranspiration for each month. Do you have any code which works for daily timestep ? Its more technical question, may be some hydrologist has gone across it already. Thanks in advance !Anup KhanalNTNU ..................Anup KhanalNorwegian Institute of science and Technology (NTNU)Trondheim, NorwayMob:(+47) 45174313 [[alternative HTML version deleted]]