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Changes to the temporal distribution of daily precipitation

Changes to the temporal distribution of daily precipitation were investigated using a data set of 12,513 land‐based stations from the Global Historical Climatology Network. The distribution of precipitation was measured using the Gini index (which describes how uniformly precipitation is distributed throughout a year) and the annual number of wet days. The Mann‐Kendall test and a regression analysis were used to assess the direction and rate of change to both indices. Over the period of 1976–2000, East Asia, Central America, and Brazil exhibited a decrease in the number of both wet and light precipitation days, and eastern Europe exhibited a decrease in the number of both wet and moderate precipitation days. In contrast, the U.S., southern South America, western Europe, and Australia exhibited an increase in the number of both wet and light precipitation days. Trends in both directions were field significant at the global scale.