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Drought index in Central West NSW during a period that included a severe drought (1982–1983). The raw monthly rainfall totals (A) were integrated to rolling 6-mo totals (B), which were then ranked into percentiles by month and rescaled to range between −4 and +4 (C). Mild drought is below −1, and so consecutive months below this threshold were counted (D). A period of 5 or more consecutive months was defined as a drought in the original method.
