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How to calculate standard precipitation index in excel?

You can see SPI calculation for Mashhad station in attached file. You can compare this file by MDM(Meteorological Drought Monitoring) or by Drought Mitigation Center software for spi. It's same as RDIT and MDM and excel file.

Name: alireza


rushdi mohammad (
sample of calculation please
Anbarasan (
Can anyone give me sample excel calculation for spi index
Calvince Wara (
When I tried via the website, I get an information that Service Unavailable
Sohrab Kolsoumi (
You can calculate spi in excel easily by using above attached excel file.
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