Abstract Although drought is a normal feature of climate, there is confusion about its characteristics in both arid and semi-arid regions. This study investigated the effects of changes in precipitation and temperature on spatio-temporal drought and humidity variations throughout the diverse (principally arid- and semi-arid) climates of Iran during recent decades using the Pedj Drought Index (PDI). The standardized anomaly index (SAI) for annual precipitation (SAIPr) and mean temperature (SAITm) was calculated using their monthly records at sixteen meteorological stations scattered throughout Iran during 1951–2010. The results showed: (1) statistically significant (p

中文翻译：

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使用 Pedj 干旱指数 (PDI) 评估伊朗湿度和干旱的长期时空变化

摘要 虽然干旱是气候的正常特征，但干旱和半干旱地区的干旱特征却存在混淆。本研究使用 Pedj 干旱指数 (PDI) 调查了近几十年来伊朗不同气候（主要是干旱和半干旱）的降水和温度变化对时空干旱和湿度变化的影响。年降水量 (SAIPr) 和平均温度 (SAITm) 的标准化异常指数 (SAI) 是使用它们在 1951-2010 年间分散在伊朗各地的 16 个气象站的月度记录计算得出的。结果表明：（1）统计显着（p