Monthly Average Weather Data
The most commonly available weather data is in the form of monthly averages. The TRNSYS Type 54 Weather Data Generator generates hourly weather data for a typical year given the monthly average values of solar radiation, dry bulb temperature, humidity ratio, and windspeed (optional). WDATA.DAT is a file of monthly average weather data from 329 sites in the United States and Canada. The data is taken from the publication Input Data for Solar Systems by Cinquemani, Owenby, and Baldwin, published by the U.S. National Oceanic and Atmospheric Administration, Asheville, NC.
NREL.DAT is also a file of monthly average weather data from the 239 US sites listed in WDATA.DAT. This file is from the National Solar Radiation Data Base (NSRDB) created by the National Renewable Energy Laboratory (NREL). This file should be more accurate and current than the data in WDATA.DAT. Monthly average weather data in the files WDATA.DAT and NREL.DAT is listed in the following format:
See section 4.1.10-1 of the TRNSYS Main Manual for more information.