Climatic Information
ASHRAE Technical Committee 4.2

Scope of TC 4.2

TC 4.2 identifies, researches, analyzes, and disseminates climatic data for design of sustainable built environments.


The ASHRAE Handbook is published in a series of four volumes, one of which is revised each year, ensuring that no volume is older than four years.

The Handbook can be purchased at the ASHRAE Bookstore by clicking on this link.

This TC is responsible for the following chapter in the Fundamentals Volume:

Chapter 14 - Climatic Design Information
This chapter and the data in the accompanying files provide the climatic design information for 8,118 locations in the United States, Canada, and around the world. This is an increase of 1,675 stations from the 2013 ASHRAE Handbook— Fundamentals. As in the previous edition, the large number of stations made printing the whole tables impractical. Consequently, the complete table of design conditions for only Atlanta, GA, appears in this printed chapter to illustrate the table format. However, a subset of the table elements most often used is presented in the Appendix at the end of this chapter for selected stations representing major urban centers in the United States, Canada, and around the world. The complete data tables for all 8,118 stations are contained in the pdf files that accompany the volume.
The map of all 8,118 sites for which climatic design information is available is available through the following link:

The ASHRAE FUNDAMENTALS HANDBOOK may be purchased from the on-line bookstore by clicking on the highlighted text.

Comment on the Handbook: ASHRAE welcomes your comments on the Handbook or a specific Handbook chapter.  To submit a comment about any aspect or part of the Handbook series, you can use the Handbook Comment Form.

Review a Handbook Chapter: To provide your feedback about a specific Handbook chapter, you can answer the brief survey questions on the Handbook Chapter Review Form.


Technical committees develop and sponsor technical sessions at the winter and annual conferences. Information about their future technical program is discussed at each TC meeting and at the TC’s Program Subcommittee meeting.

ASHRAE publishes papers and transactions from presentations at its conference events. In addition, ASHRAE records most of the seminar sessions from its conferences on DVD. These DVDs are ideal for use at chapter meetings, in university courses, or company lunch and learns. Products available from the most recent conference may be found here.


Technical Committees are responsible for identifying research topics, proposing research projects, selecting bidders, and monitoring research projects funded by ASHRAE. Information about their specific research program is discussed at each TC meeting and at the TC’s Research Subcommittee meeting.

This TC has the following active research projects:

1847-RP Updating climatic design information for the 2021 ASHRAE Handbook, Standard 169, and the Handbook of Smoke Control Engineering

This project is tasked with the four-year update of the climatic design tables in the Handbook - Fundamentals, the update of the tables in ANSI/ASHRAE Standard 169: Climatic Data for Building Design Standards Standard, and the calculation of climatic tables in support of the Handbook of Smoke Control Engineering. Its objectives are:

1.    Recalculate climatic design conditions for Chapter 14 of the Handbook - Fundamentals, which will require obtaining the most recent hourly weather observations for the period 1994-2018 from NOAA and Environment Canada for global locations, with spatial distribution covering all continents and countries to the greatest extent possible as allowed by the climatic data available.
2.    Provide an analysis of climatic trends (means and extremes) of temperature and moisture (using an appropriate statistical method) for each location, as provided in the 2013 and 2017 Handbook – Fundamentals. Provide ways to report that information, on a per-station and/or regional basis, along with the climatic design data in the Handbook. Research and implement the development of indicators for future climate, on a per-station and/or regional basis, which can assist engineering in designing building for the climate of the future.
3.    Update the clear-sky radiation coefficients, based on updated analysis of remotely sensed aerosol data.
4.    Add new elements such as prevailing wind information, including percent of the month that the most frequent wind directions occur, and mean and median speed of the prevailing winds, in support of the Handbook of Smoke Control Engineering, and the Weather and Shielding Factor (WSF) in support of Standard 169.
5.    Provide material for inclusion in Chapter 14 of the Handbook – Fundamentals,  and future versions of Standard 169:
•    Updated tables of climatic design information for all stations with sufficient period of record;
•    Elements in support of updating the text of the chapter itself;
•    Climate zones maps for Standard 169.
6.    Update the Weather Data Viewer with the same stations and climatic design information as the Handbook, and prepare a new, web-based version of the Weather Data Viewer.
7.    Provide tables of climatic design information specific to the ASHRAE Handbook of Smoke Control Engineering.


ASHRAE writes standards for the purpose of establishing consensus for: 1) methods of test for use in commerce and 2) performance criteria for use as facilitators with which to guide the industry. ASHRAE publishes the following three types of voluntary consensus standards: Method of Measurement or Test (MOT), Standard Design and Standard Practice. ASHRAE does not write rating standards unless a suitable rating standard will not otherwise be available. ASHRAE is accredited by the American National Standards Institute (ANSI) and follows ANSI's requirements for due process and standards development. Standards may be purchased at the ASHRAE Bookstore.

This TC is cognizant for the following standard:

ANSI/ASHRAE Standard 169: Climatic Data for Building Design Standards

Other Activities

TIP: If MTG involvement add here otherwise leave blank.


ASHRAE Technical FAQs are provided as a service to ASHRAE members, users of ASHRAE publications, and the general public. While every effort has been made to ensure their accuracy and reliability, they are advisory and provided for informational purposes only, and in many cases represent only one person’s view. They are not intended and should not be relied on as an official statement of ASHRAE. Technical questions not addressed may be submitted to the ASHRAE Technical Services department at

This TC is responsible for the following frequently asked questions:

Where can I get design weather data for my area? (41)
Where can I get hourly, daily, and monthly weather data for my area? (42)
Where can I get historic weather data for a particular time period to show that it was unusually hot or cold? (43)

Additional FAQs related to climatic information can be found on this link.