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Weather Data

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International Weather for Energy Calculation (IWEC) files, which cover 3,012 worldwide locations outside the United States and Canada, are now available for individual purchase.

ASHRAE, in collaboration with White Box Technologies (WBT), provides instant web access to ASHRAE's IWEC2 weather files for individual purchase or as sets by country or region. Learn more

International Weather for Energy Calculations, v 2.0

international weather.jpgThis DVD contains "typical" weather files, suitable for use with building energy simulation programs, for 3,012 locations outside the United States and Canada.

The files are derived from Integrated Surface Hourly (ISH) weather data originally archived at the National Climatic Data Center. For these selected locations, the ISH database contains weather observations on average at least four times per day of wind speed and direction, sky cover, visibility, ceiling height, dry-bulb temperature, dew-point temperature, atmospheric pressure, liquid precipitation, and present weather for at least 12 years of records up to 25 years.

View a list of IWEC2 station locations included on the DVD


Additional Climate Data Resources from ASHRAE

ASHRAE Climate Data Center