For hourly energy simulations, the type of data used in the hourly weather data. This information is generally found in the name of the weather data file, as well as in the header of the data file. In the United States, the normal type of data is Typical Meteorological Year (TMY), which represent a year of typical climatic conditions for a location. The data set is composed of 12 months of typical meteorological data concatenated to form a single year with a complete data set for primary measurements. The monthly data sets contain actual meteorological measurements and modeled solar values.
Weather Data Type
|List Options||Option Definition||Unit of Measure|
|Not applicable||Not applicable||None|
|TMY||The original Typical Meteorological Year (TMY) data was developed at Sandia National Laboratory in 1978 and represents data from 1948 - 1980.||None|
|TMY2||TMY2 was completed in March 1994 by the National Renewable Energy Laboratory (NREL), contains data for 239 locations, and represents weather data from 1961-1990.||None|
|TMY3||TMY3 was developed by NREL, contains data for 1020 locations, and represents weather data from 1992-2005.||None|
|IWEC||The International Weather for Energy Calculation (IWEC), developed by ASHRAE to represent typical weather data for building energy analysis for 227 locations outside the United States and Canada. This weather data is derived from up to 18 years of DATSAV3 hourly weather data originally archived at the National Climatic Data Center. The weather data is supplemented by solar radiations estimated on an hourly basis from earth-sun geometry and hourly weather elements, particularly cloud amount information.||None|
|CWEC||Canadian Weather for Energy Calculations (CWEC); 80 files containing hourly weather observations representing an artificial one-year period specifically designed for building energy calculations; developed by Numerical Logic in collaboration with Environment Canada and the National Research Council of Canada.||None|
|CZRV2||California weather data for the 16 California climate zones used to demonstrate compliance with Title 24 with approved building energy simulation programs.||None|
|On site measurement||Weather data accumulated from on site measurement||None|
|Weather station||Weather data directly from weather station||None|
CSV or XML files containing information such as definition, unique ID, and URL for each BEDES Term or List Option can be downloaded by clicking the appropriate orange button. The downloaded file can then be processed offline. Note that the XML documents are simply a "flat file" of terms, not a structured schema.