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I think Standardized Precipitation Index (SPI) is good fit with your objective. The SPI value is spanning from -3 to +3, positive SPI values indicate greater than median precipitation (Wet) and negative values indicate less than median precipitation (Dry). You can read the official guideline from WMO here: http://www.wamis.org/agm/pubs/SPI/WMO_1090_EN.pdf ...


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