Useful for resiliency simulation and guaranteeing net zero energy operation even in extreme years.

XMY (.epw) Extreme Meteorological Year weather files, similar to TMY but taking extreme weather instead of average or representative weather.

Useful for near term design and localized energy efficiency estimates. The '3' in TMY3 has a different meaning in this case.

TMY3, TMY5, TMY7, TMY10 (.epw) Typical Meteorological Year weather files, but from the last 3, 5, 7, or 10 years.

Used for energy simulations for energy efficiency improvements. TMY3 is the most common, and represents an average of 30 years of weather for a given location.

TMY, TMY2, TMY3 (.epw) Typical Meteorological Year weather files.Design Days (.ddy) Design weather days used for sizing HVAC equipment.Accounting for climate change and future weather conditions.Appropriate design and HVAC system selection.Under WMO leadership, the National Meteorological and Hydrological Services and its members contribute to the safety and welfare of humanity. The World Meteorological Organization (WMO) is the specialized agency of the United Nations for meteorology (weather and climate), operational hydrology, and related geophysical sciences.

GCOS Home World Meteorological Organization (WMO) The Global Climate Observing System (GCOS) provides comprehensive information on the total climate system, involving a multidisciplinary range of physical, chemical, and biological properties as well as atmospheric, oceanic, hydrological, cryospheric, and terrestrial processes. Launch CDO Map Other Organizations Global Climate Observing System (GCOS) Various themes based on products, programs, and observation types are available including average, maximum, and minimum temperatures, as well as precipitation data. The Climate Data Online Mapping Tool displays interactive maps of a variety of hourly, daily, and monthly observations. Access Tools Climate Data Online (CDO)Ĭlimate Data Online provides access to a wide variety of NCEI’s historical weather and climate data in addition to station history information. Members of the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) and other building engineers may find the resources below helpful. Heating, refrigerating, and air-conditioning engineers use global weather and climate information to build systems and gauge energy efficiency, indoor air quality, refrigeration, and sustainability.

Ashrae weather data files