The Fourth Assessment report of the Intergovernmental Panel on Climate Change indicated that the future temperature may increase due to the increase in Greenhouse Gas (GHG) concentrations. In the past decades, Iran’s average temperature has been found to increase. In the recent 50 years, the annual average temperature in Iran has seen an increase of 0.224 oC/ decade. Climate model projections showed that global mean temperatures will increase in this century. The 21st century temperature is expected to increase between 1.5 and 5.7 °C by 2100 in Asia depending on scenarios .
Increasing temperatures causes snow cover retreat and changes in the global patterns of precipitation. Changes in precipitation and snow cover area will affect water resources, river runoff, hydrologic conditions, duration of the growing season and energy. Any significant changes in temperature, precipitation and snow cover area are important for water resource management, policy makers, industry and agriculture
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