Typical Meteorological Year (Version Superseded)

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.