Iran’s Changing Climate over the Past 30 Years

In this study, monthly meteorological parameters of temperature, precipitation, and wind speed recorded at 104 synoptic weather stations scattered across Iran were analyzed to construct annual time series of the meteorological data for a 30-year period (1988–2017) using the Mann–Kendall test and the Sen’s slope estimator. Based on the de Martonne aridity index ( I_DM ) classification, Iran’s climate is mostly categorized as dry and semi-dry. The results indicated annual temperature significantly increased at about 61