ddy files are distributed with TMY3 data for that location, if available.Ĭlimate change is moving fast enough that TMY3 datasets will no longer be valid for loads or energy modeling several decades out.įuture weather is predicted by using a global circulation model (GCM) at fine resolution, and simulating future weather.

ASHRAE 2013 Design Conditions Definitions in E+ format: Annual, Monthly.

ASHRAE 2017 Design Conditions Definitions in E+ format: Annual, Monthly.

ASHRAE Climatic Design Conditions 2009/2013/2017.

Weather from a specific year, used for calibrating an energy model.

AMY (.epw) Annual Meteorological Year weather files.

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.

Ecotect wind rose