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Note that values in monthly (and for longer accumulation periods also annual) time series of the data therefore are likely to be autocorrelated. The standard period which was used to fit the generalised logistic distribution is 1961-2010. The dataset covers the period from 1961 to 2012. 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SPEI is a drought index based on the Climatic Water Balance (precipitation minus evapotranspiration) over a given accumulation period, following Vicente Serrano et al. (2010). Values are calculated for accumulation periods of 1, 3, 6, 12, 18 and 24 months, each computed for every calendar month, meaning monthly and longer-period time series may show autocorrelation. The generalised logistic distribution used to derive the index was fitted to the standard reference period 1961-2010, while the dataset itself spans 1961 to 2012. 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