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Gridded Standardized Precipitation Index (SPI) using gamma distribution with standard period 1961-2010 for Great Britain [SPIgamma61-10]

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Gridded 1km and 5km Standardised Precipitation Index (SPI) data for Great Britain, published by the Environmental Information Data Centre. SPI is a drought index based on the probability of precipitation for a given accumulation period, following McKee et al. (1993), and is calculated here for accumulation periods of 1, 3, 6, 12, 18 and 24 months, each computed for every calendar month. Values are fitted using a gamma distribution with a standard reference period of 1961-2010, and the dataset itself spans 1961 to 2012. Monthly and longer-period time series may show autocorrelation. Full details are available via the associated DOI record.1km and 5km gridded Standardised Precipitation Index (SPI) data for Great Britain, which is a drought index based on the probability of precipitation for a given accumulation period as defined by McKee et al. (1993). SPI is calculated for different accumulation periods: 1, 3, 6, 12, 18, 24 months. Each of these is in turn calculated for each of the twelve calendar months. 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 gamma distribution is 1961-2010. The dataset covers the period from 1961 to 2012. Full details about this dataset can be found at https://doi.org/10.5285/94c9eaa3-a178-4de4-8905-dbfab03b69a0.