How to get daily Standard Precipitation Index (SPI) value for daily data?

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Bilel Zerouali

You can use the proposed method of McKee et al. (1993) (McKee, Thomas B, Nolan J Doesken, and John Kleist. (1993) the Relationship of Drought Frequency and Duration to Time Scales. In Proceedings of the 8th Conference on Applied Climatology, 17, 179-183: American Meteorological Society Boston, MA, USA.)

The SCI package of R language most used for SPI calculation

Hsang Jaknr Hieng

you can use a smooth mean of daily rain with a step of 30 or 60 days

Alireza Araghi

https://cran.r-project.org/web/packages/SCI/index.html

https://drought.unl.edu/droughtmonitoring/SPI/SPIProgram.aspx

Dounia Mrad

https://gist.github.com/discover

Brian Collins

https://cran.r-project.org/web/packages/SPEI/index.html

Lipon Chandra Das

Firstly you calculate average value from rainfall data (year wise) then use R studio. If have no SPEI packages in R studio you can install this.Using R studio calculate SPI value is very easy.