Shahram Delfani - Department of Installation, Building and Housing Research Center (BHRC)
Maryam Karami - Department of Mechanical Engineering, Faculty of Engineering, University of Tehran
Moien Farmahini-Farahani - School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman

The sky temperature affects performance of solar heating and nocturnal cooling systems. In this paper, monthly clear sky temperature contours of a multiclimatecountry, Iran, have been depicted. The Bin method is used to analysis climatic data and reach design values that occur more frequently. Contours are drawn based on three-hour step records at thirty eight stations. Finally, cities based on the local clear sky temperature variation are categorized in four regions.Also, a comparison between the sky temperatures of cities resulting from bin method and average method is presented.

Sky temperature, Clear sky, Contourtemperature, Multi-climate country