The following code produces a graph with monthly ET from 2001-2015 over a region.


In contrast, when plotting the daily data,


exporting to excel and summing up the daily values to get monthly values, the results change significantly.

e.g. January 2001: 33 mm (resulting from the first code) and 57 mm (result of the sum of 8-day values manually with excel, picture).

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The study area is the same, does anyone know where the problem is?

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