Rainfall Seasonality IndexThe Rainfall Seasonality Index is a measure of the degree of seasonal variation in rainfall

It is calculated using the following equation from Walsh and Lawler¹:

Where R_i is the total annual rainfall for the year i and X in is the monthly rainfall for month n.

Units:---

Data source:CRU TS3.21: Climatic Research Unit (CRU) Time-Series (TS) Version 3.21 of High Resolution

Gridded Data of Month-by-month Variation in Climate (Jan. 1901- Dec. 2012).

GPCC First Guess Monthly Product: Global Precipitation Climatology Centre (Jan. 2013 - present).

¹Walsh, R. P. D. and Lawler, D. M. (1981), RAINFALL SEASONALITY: DESCRIPTION, SPATIAL PATTERNS

AND CHANGE THROUGH TIME. Weather, 36: 201-208. doi: 10.1002/j.1477-8696.1981.tb05400.x.

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