Typical Meteorological Year (Version Superseded)

This dataset has been superseded by newer versions. Please see Associated Resources for more information. Typical Meteorological Year (TMY) is a digital data set archived at the National Centers for Environmental Information (NCEI). Solar radiation and surface meteorological data recorded on an hourly basis are included in this file. These data cover recording periods from January 1953 through December 1975 for 26 data rehabilitation stations, although the recording periods for some stations may differ. The TMY files comprise specific calendar months selected from the entire recorded span for a given station as the most representative or typical, for that station and month. For example, a single January is chosen from the 23 Januarys for which data are recorded from 1953 through 1975 on the basis of its being most nearly like the composite of all 23 Januarys. Thus, for a given station, January of 1967 might be selected as the typical meteorological month after all of the other 22 Januarys. This process is pursued for each of the other calendar months, and the twelve months chosen then constitute the TMY. The major parameters in this file are solar time, extraterrestrial radiation (RAD), direct radiation, diffuse radiation, net radiation, tilt radiation, observed radiation, engineering corrected radiation, standard year corrected radiation, sunshine, sky condition, visibility, weather, pressure, temperature and snow cover.