New answers tagged database
Display XY Data > Natural Neighbor Interpolation - use the points you just created as the Input Point Features and the Z value set to average precipitation. That will get you a raster surface of rainfall which you can represent how you choose. *Be aware that with Natural Neighbor Interpolation, you may need to add some 'Anchor Points' so as to ensure ...
Build Thiessen Polygons tool would probably accomplish this. Convert the csv to a point file and go from there.
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