Ensure that your Load or Energy Calculations Are Based on Climate Data from ASHRAE:
- StationFinder—Search weather stations as published in the 2001, 2005, 2009, 2013, 2017, 2021, or 2025 ASHRAE Handbook—Fundamentals on a map by name or geographic location.
- Weather Data Viewer—Comprehensive climate data for the 12,424 stations listed in the 2025 ASHRAE Handbook—Fundamentals (published in June 2025) accessed via a user-friendly interface, plus tools and calculators to help use the data effectively.
- International Weather for Energy Calculations—Typical weather files, suitable for use with building energy simulation programs for 3,012 locations outside the United States and Canada. Purchase the DVD or individual files.
- Chapter 14, Climatic Design Information, from the 2021 ASHRAE Handbook—Fundamentals—Climatic design information tables from ASHRAE Research Project RP-1847 for 9,237 locations in the United States, Canada, and around the world.
- Standard 169-2021, Climatic Data for Building Design Standards—Standard climate zone maps and data for 9,237 worldwide locations from ASHRAE Research Project RP-1847, as published in the 2021 ASHRAE Handbook—Fundamentals.
- ASHRAE Climatic Design Data License for Software Engineers—a license enabling software developers to download and use the 500+ design elements, the 12,424 *.WDV files, and the Microsoft© Excel© spreadsheets of the climatic design information for all 12,424 stations listed in the 2025 ASHRAE Handbook—Fundamentals (published in June 2025).
International Weather for Energy Calculations, version 2.0
Purchase the DVD or Individual Files
This DVD contains "typical" weather files, suitable for use with building energy simulation programs, for 3,012 locations outside the United States and Canada.
DVD files format: CSV
View a list of station locations for IWEC2 files
Purchase
Individual Files and Sets
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.
Individual and sets files formats: EPW, BINM, and CSV
Learn more
Chapter 14, Climatic Design Information, from the 2021 ASHRAE Handbook—Fundamentals
Worldwide Climate Data for HVAC Calculations
Includes climatic design information tables (from ASHRAE Research Project RP-1847) for 9,237 locations in the United States, Canada, and around the world—information used for design, sizing, distribution, installation, and marketing of HVAC and dehumidification equipment, as well as for other energy-related processes in residential, agricultural, commercial, and industrial applications.
Tables, included as a .zip file with the purchase of the chapter (.pdf), include dry-bulb, wet-bulb, and dew-point temperatures; wind speed with direction at various frequencies of occurrence; monthly degree-days to various bases; precipitation; and parameters to calculate clear-sky irradiance. Information includes monthly and annual percentiles, to provide seasonally representative combinations of temperature, humidity, and solar conditions.
These data are also available through a subscription to ASHRAE Handbook Online.
View a list of station locations with table data in Chapter 14
View a sample station data table
Purchase I-P
Purchase SI
Weather Data Viewer
Purchase Weather Data Viewer as a stand-alone product, or access it as part of ASHRAE Handbook Online:
- Weather Data Viewer (stand-alone product) – the interactive interface can be accessed online via an annual subscription
- As part of ASHRAE Handbook Online – the interactive interface can be accessed via an ASHRAE Handbook Online annual subscription under ASHRAE Handbook—Fundamentals on the Additional Features tab of the Home page or from the Contents or Additional Features tabs of Chapter 14
Weather Data Viewer provides climatic design information for 12,424 weather stations worldwide – an increase of 35% worldwide from 2021. It includes quantities such as dry-bulb temperature, dew-point temperature, wet-bulb temperature, wind speed, and wind direction at various frequencies of occurrence over a long period (8+ years) as well as access to the underlying frequency data for further analysis and visualization. Users are also able to filter coincident conditions of dry-bulb and wet-bulb temperatures for selected hours in the day (e.g., 7:00 a.m. to 7:00 p.m.).
Users can plot the frequency distribution, the cumulative distribution function, and the mean coincident functions and view joint frequency matrices of dry-bulb temperature and time of day (also known as temperature bin data) and additional information, such as the months and years that were used for station design condition calculations.
Weather Data Viewer also implements various calculation methods found in the ASHRAE Handbook, such as those for return period minimum/maximum temperatures, degree-days to any base, design day profiles including clear sky solar radiation, and decadal trends in some of the key design values. The data for all functions can be viewed in I-P or SI units and can be toggled between the units.
A variety of figure widgets are also available to enable examination of various aspects of the climatic data beyond that in the simple climatic design conditions in the summary PDFs. Each figure can be exported in SVG or PNG format, and the underlying data can be downloaded in CSV format.
Access FAQ for Weather Data Viewer here
LOG INPurchase Weather Data Viewer (stand-alone product)
Standard 169-2021, Climatic Data for Building Design Standards
ANSI/ASHRAE Standard 169, Climatic Data for Building Design Standards, serves a comprehensive source of climate data for those involved in building design, and provides a variety of climatic information for designing, planning, and sizing building energy systems and equipment.
The standard provides dry-bulb, dew-point and wet-bulb temperatures; enthalpy; humidity ration; wind conditions; solar irradiation; latitude; longitude; and elevation for locations worldwide. Standard 169 also includes statistical data, such as mean temperatures; daily ranges; degree hours; and seasonal percentages within ranges of temperatures.
Data and tables have been completely revised for the 2021 edition. The standard now includes climatic data for 9237 locations throughout the world, an increase of 1119, as well as climate zone maps for major global regions. Data are compiled from the 2021 ASHRAE Handbook—Fundamentals, Chapter 14, “Climatic Design Information,” and other data developed specifically for this standard from ASHRAE RP-1847, “Updating Climatic Design Information for the 2021 ASHRAE Handbook, Standard 169, and the Handbook of Smoke Control Engineering.”
Files formats: PDF, XLS
PURCHASE
ASHRAE Climatic Design Data License for Software Engineers
Software developers can purchase a license to download and use the 500+ design elements, the 12,424 *.WDV files, and the Microsoft© Excel© spreadsheets of the climatic design information for all 12,424 stations listed in the 2025 ASHRAE Handbook—Fundamentals (published in June 2025).
Access FAQ for the ASHRAE Climatic Design Data License for
Software Developers here
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