Agricultural And Meteorological Softwares Agricultural And Meterological Softwares

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How can we calculate PNI (Percent of Normal Index) and what are the inputs data and time scales

The PNI was described by Willeke et al. (1994) as a percentage of normal precipitation. It can be calculated for different time scales (monthly, seasonally, and yearly). For calculation, first the precipitation in time increment i (mm) should divide to the normal precipitation for the study period (mm), then multiply the output by 100.


Willeke G, Hosking J R M, Wallis J R, et al. 1994. The national drought atlas. In: Institute for Water Resources Report 94-NDS-4. U.S Army Corp of Engineers, CD-ROM. Norfolk, VA.

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