In the TMY2 example, the TMY2 data set was developed as described below and the format of the data is usually called a TMY2 format.Īny data could be put into a TMY2 format, but it wouldn’t necessarily be selected using the same procedures as the TMY2 data set. A data format is merely the identification of data elements in a data file. Simply stated, a data set refers to a set of data files developed around a set of procedures for selection and usually with a specific purpose for use. In this document as well in many others, you will read about a certain “data set” and you will also read about data in a “certain” format - e.g., the TMY2 data set and the TMY2 data format. This data may not always be complete data items or periods of record may be missing. NCDC can provide hourly historical data for thousands of locations around the world. National Climatic Data Center (NCDC) in Asheville, NC. The primary source for historical weather data is the U.S. Typical data may also be “real” data but may not be a contiguous year - the data may be comprised of months from multiple years. Typical years are ersatz years assembled to match the long term data from a particular location using a particular statistical measure. Historical data is just “real” data: usually measured (but sometimes modeled) data from a particular location for a given period of record. Source weather data for building energy simulation programs can be broken into two major classes: historical data and typical weather years.
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