The 12 months, January–December, selected from the entire period of record
span for a given location as the most representative, or typical, for that month.
Thus, for a given station
, a typical year will be a composite year with, possibly, each month of data from a different calendar year
. As applied to the building construction and energy management industries, a typical meteorological year (TMY) consists of a full set of 8760 hourly weather observations
(365 days × 24 h) containing real weather sequences
that represent the long-term climatic modal (i.e., most frequent) conditions for a particular location. The hourly data include extraterrestrial, global and direct solar radiation
estimates and observed ceiling
, sky cover
, weather (type), sea level
and station pressure
and dewpoint temperatures
, cloud amounts
, and total
and opaque sky cover
. TMY data have been utilized, for example, by engineers in the design and evaluation of energy systems.
Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact firstname.lastname@example.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.