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ANSI/ASHRAE Addendum a to

ANSI/ASHRAE Standard 169-2013

Climatic Data for

Building Design

Standards

Approved by ASHRAE and the American National Standards Institute on July 31, 2020.

This addendum was approved by a Standing Standard Project Committee (SSPC) for which the Standards Committee has

established a documented program for regular publication of addenda or revisions, including procedures for timely, docu-

mented, consensus action on requests for change to any part of the standard. Instructions for how to submit a change can

be found on the ASHRAE website (https://www.ashrae.org/continuous-maintenance).

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ASHRAE Standing Standard Project Committee 169

Cognizant TC: 4.2, Climate Information

SPLS Liaison: Walter Grondzik

Drury B. Crawley*, ChairEvyatar Erell Didier J. Thevenard*

Joshua New*, Vice-ChairJack N. Lott Russell Vose*

Parag Rastogi*, SecretaryRobert J. Morris Justin Wong

Riad G. Assa Michael Roth*

* Denotes members of voting status when the document was approved for publication

ASHRAE STANDARDS COMMITTEE 2020-2021

Drury B. Crawley, ChairSrinivas Katipamula David Robin Rick M. Heiden, Vice ChairGerald J. Kettler Lawrence J. Schoen

Els Baert Essam E. Khalil Steven C. Sill

Charles S. Barnaby Malcolm D. Knight Richard T. Swierczyna Robert B. Burkhead Jay A. Kohler Christian R. Taber

Thomas E. Cappellin Larry Kouma Russell C. Tharp

Douglas D. Fick Cesar L. Lim Theresa A. Weston

Walter T. Grondzik James D. Lutz Craig P. Wray

Susanna S. Hanson Karl L. Peterman Jaap Hogeling, BOD ExO Jonathan Humble Erick A. Phelps William F. McQuade, CO

Connor Barbaree, Senior Manager of Standards

© ASHRAE. Per international copyright law, additional reproduction, distribution, or transmission in either print or digital form

is not permitted without ASHRAE's prior written permission.

ANSI/ASHRAE Addendum a to ANSI/ASHRAE Standard 169-2013 1 (This foreword is not part of this standard. It is merely informative and does not contain requirements

necessary for conformance to the standard. It has not been processed according to the ANSI requirements

for a standard and may contain material that has not been subject to public review or a consensus process.

Unresolved objectors on informative material are not offered the right to appeal at ASHRAE or ANSI.)

FOREWORD

Standard 169 provides a comprehensive source of climate data for those involved in building design. It has been

established to provide a variety of climatic information used primarily for the design, planning, and sizing of

buildings' energy systems and equipment. This standard is referenced in other standards, such as Standards 90.1,

90.2, and 189.1.

The data presented in this standard are compiled from the 2017 ASHRAE Handbook - Fundamentals, Chapter 14,

"Climatic Design Information," and other data developed specifically for this standard from ASHRAE RP-1699,

"Updating the ASHRAE Climatic Data for Design and Standards."

The data and tables have been completely revised and updated from Standard 169-2013. The standard now also

includes the weather and shielding factor (WSF) required in Standard 62.2-2016. The standard includes data for

8118 locations throughout the world, an increase of 2554.

Where changes are shown in the text, new text is shown by underline and deleted text shown by strikeout. Due to

the large increase in the number of locations covered in this station and the resulting changes, some tables are

replaced in their entirety rather than using strikeout and underline, indicated by italics.

© ASHRAE. Per international copyright law, additional reproduction, distribution, or transmission in either print or digital form

is not permitted without ASHRAE's prior written permission.

2 ANSI/ASHRAE Addendum a to ANSI/ASHRAE Standard 169-2013 Addendum a to 169-2013

3. DEFINITIONS, ABBREVIATIONS, AND ACRONYMS

3.1 Definitions

degree-day: the difference in temperature between the outdoor mean temperature over a 24-hour period and a given

base temperature. For the purposes of determining building envelope requirements, tThe classifications are defined

as follows:

cooling degree-day base 50°F, CDD50 (10°C, CDD10): for any one day, when the mean temperature is more than

50°F (10°C), there are as many degree-days as degrees Fahrenheit or Celsius temperature difference between the

mean temperature for the day and 50°F (10°C) (mean temperature minus 50°F [10°C]). Annual cooling degree-days

(CDDs) are the sum of the degree-days over a calendar year.

heating degree-day base 65°F, HDD65 (18.3°C, HDD18): for any one day, when the mean temperature is less than

65°F (18.3°C), there are as many degree-days as degrees Fahrenheit or Celsius temperature difference between and

65°F (18.3°C) and the mean temperature for the day (65°F [18.3°C] minus the mean temperature). Annual heating

degree-days (HDDs) are the sum of the degree-days over a calendar year.

3.2 Abbreviations and Acronyms

DBAvg = average daily dry-bulb temperature, °F (°C) DBSD = standard deviation of average daily dry-bulb temperature, °F (°C)

Hours 8/4 12.8/20.6 = number of hours between 8 a.m. and 4 p.m. with DB between 55°F and 69°F (12.8°C and

20.6°C)

N/A = not available

Precip = liquid precipitation, in. (mm)

PrecAvg = average precipitation, in. (mm)

PrecMax = maximum precipitation, in. (mm)

PrecMin = minimum precipitation, in. (mm)

PrecStd = standard deviation of precipitation, in. (mm) RadAvg = monthly mean daily all-sky radiation, Btu/ft 2 -day (kWh/m 2 -day) Sd = standard deviation of daily average temperature, °F (°C)

Tavg = average temperature, °F (°C)

WSAvg = wind speed, mph (m/s)

WSF = weather and shielding factor (1/h), see ASHRAE Standard 62.2-2016

© ASHRAE. Per international copyright law, additional reproduction, distribution, or transmission in either print or digital form

is not permitted without ASHRAE's prior written permission. ANSI/ASHRAE Addendum a to ANSI/ASHRAE Standard 169-2013 3 4. CLIMATIC DESIGN DATA AND CLIMATE ZONES

Normative Appendix A comprises data for 5564 8118 U.S., Canadian, and international locations. This information

generally represents annual and monthly percentiles of occurrence of temperature, various measures of humidity,

and wind speed for use in the design of building energy and ventilation systems. These data also include HDD and

CDD annual average values and the number of hours between 8 a.m. and 4 p.m. when the dry-bulb temperature is

between 55°F and 69°F (13°C and 21°C) heating and cooling design temperatures. A sample of this climatic data

is provided in Table A-1 for Atlanta, Georgia, USA. Design conditions for all 5564 8118 locations are located

online at the following location: [link]

Table A-2 in Normative Appendix A provides thermal climate zone definitions. Tables A-3, A-5, and A-6 in

Normative Appendix A lists climate zones and other key climatic data for U.S., Canadian, and international

locations and includes links to the design conditions contain the WMO#, latitude, longitude, climate zone

assignment, and weather and shielding factor (WSF) for the United States, Canada, and other international locations,

respectively. Table A-3 also contains the climate zones for all U.S. counties along with climate locations within

each county.

5. U.S. CLIMATE ZONES BY COUNTY

Normative Appendix B contains the climate zones for all U.S. counties. The information for U.S. counties is

presented in the form of a map in Figure (Figure AB-2) and Table A-4B-1 for the U.S. Table A-3 provides criteria

for determining the climate zones of international locations for which general climate summary information is

available.

56. INTERNATIONAL CLIMATE ZONE MAPS

Informative Appendix C B provides illustrative climate zone maps for major countries and continents. These maps

do not supersede the information in Normative Appendix A. The maps are one-half-degree latitude by one five-

eighths-degree longitude resolution. For this reason, the data and climate zones for specific locations outside the U.

S. presented in Normative Appendix A shall be used. These maps are provided to show general locations of the

climate zones.

© ASHRAE. Per international copyright law, additional reproduction, distribution, or transmission in either print or digital form

is not permitted without ASHRAE's prior written permission.

4 ANSI/ASHRAE Addendum a to ANSI/ASHRAE Standard 169-2013 (This is a normative appendix and is part of this standard.)

NORMATIVE APPENDIX A

CLIMATIC DESIGN DATA AND CLIMATE ZONES

A1. CLIMATIC DESIGN CONDITIONS

• Time zone code (e.g., NAE = Eastern Time, USA and Canada). A spreadsheet in the accompanying data files

Table A-2 lists all the time zone codes used in the tables of climatic design conditions. The time zone codes

embody the offset from UTC as well as any applicable daylight savings time scheme (in effect in 2017).

• Period analyzed (e.g., 82-06 90-14 = data from 1982 to 2006 1990 to 2014 were used) A1.1.2 Annual Cooling, Dehumidification, and Enthalpy Design Conditions • Extreme maximum wet-bulb temperature, °F (°C)

A1.1.3 Extreme Annual Design Conditions

• Wind speed corresponding to the 1.0%, 2.5%, and 5.0% annual cumulative frequency of occurrence in mph

(m/s) • Extreme maximum wet-bulb temperature in °F (°C)

• Mean and standard deviation of extreme annual minimum and maximum dry-bulb temperature in °F (°C)

• 5-, 10-, 20-, and 50-year return period values for minimum and maximum extreme dry-bulb temperature in °F

(°C)

• 5-, 10-, 20-, and 50-year return period values for minimum and maximum extreme wet-bulb temperature in °F

(°C)

A2. MONTHLY CLIMATIC DESIGN CONDITIONS

Monthly design conditions are divided into subsections as follows. A2.1 Temperatures, Degree-Days, and Degree-Hours, Wind, and Precipitation

• Average temperature in °F (°C). This parameter is a prime indicator of climate and is also useful to calculate

heating and cooling degree-days to any base.

• Standard deviation of average daily temperature in °F (°C). This parameter is useful to calculate heating and

cooling degree-days to any base.

• Heating and cooling degree-days (bases 50°F and 65°F [10°C and 18.3°C]). These parameters are useful in

energy estimating methods. They are also used to classify locations into climate zones in Appendix AB.

• Cooling degree-hours (bases 74°F and 80°F [23.3°C and 26.7°C]). These are used in various standards, such as

Standard 90.2.

• Monthly average wind speed, mph (m/s). This parameter is useful to estimate the wind potential at a site;

however, the local topography may significantly alter this value, so close attention is needed.

• Average precipitation, in (mm). This parameter is used to calculate climate zones for Standard 169 and is of

interest in some green building technologies (e.g., vegetative roofs).

© ASHRAE. Per international copyright law, additional reproduction, distribution, or transmission in either print or digital form

is not permitted without ASHRAE's prior written permission.

ANSI/ASHRAE Addendum a to ANSI/ASHRAE Standard 169-2013 5 • Standard deviation of precipitation, in (mm). This parameter indicates the variability of precipitation at the site.

• Minimum and maximum precipitation, in (mm). These parameters give extremes of precipitation and are useful

for green building technologies and stormwater management. A2.2 Monthly Design Dry-Bulb, Wet-Bulb, and Mean Coincident Temperatures. These values are derived

from the same analysis that results in the annual design conditions. The monthly summaries are useful when

seasonal variations in solar geometry and intensity, building or facility occupancy, or building use patterns require

consideration. In particular, These values can be used when determining air-conditioning loads during periods of

maximum solar radiation. The values listed in the table include

• dry-bulb temperature corresponding to the 0.4%, 2.0%, 5.0%, and 10.0% cumulative frequency of occurrence

for the indicated month in °F (°C), and the mean coincident wet-bulb temperature in °F (°C) and

• wet-bulb temperature corresponding to the 0.4%, 2.0%, 5.0%, and 10.0% cumulative frequency of occurrence

for the indicated month in °F (°C), and the mean coincident dry-bulb temperature in °F (°C)

For a 30-day month, the 0.4%, 2.0%, 5.0%, and 10.0% values of occurrence represent the value that occurs or is

exceeded for a total of 3, 14, 36, or 72 hours, respectively, per month on average over the period of record. Monthly

percentile values of dry-bulb or wet-bulb temperature may be higher or lower than the design conditions

corresponding to the same nominal percentile, depending on the month and the seasonal distribution of the

parameter at that location. Generally, for the hottest or most humid months of the year, the monthly percentile value

will exceed the design condition for the same element corresponding to the same nominal percentile. For instance,

Table A-1 shows that the annual 0.4% design dry-bulb temperature in Atlanta, GA is 93.94.0°F (34.4°C). The 0.4%

monthly dry-bulb temperature exceeds 93.94.0°F (34.4°C) for June, July, and August, with values of 94.75°F

(34.97°C), 97.96°F (36.64°C), and 96.37.4°F (35.76.3°C), respectively.

A general, very approximate rule of thumb is that the n% annual cooling design condition is roughly equivalent to

the 5n% monthly cooling condition for the hottest month; that is, the 0.4% annual design dry-bulb temperature is

roughly equivalent to the 2% monthly design dry-bulb temperature for the hottest month; the 1% annual value is

roughly equivalent to the 5% monthly value for the hottest month, and the 2% annual value is roughly equivalent

to the 10% monthly value for the hottest month.

A2.5 All-Sky Solar Radiation. All-sky solar radiation parameters are useful for evaluating the potential of solar

technologies (e.g., solar heating, photovoltaics), which are valuable in the design of net-zero energy buildings.

Parameters listed in the tables are:

• Monthly average daily global radiation on a horizontal surface. This is a traditional way to characterize the solar

resource at a site.

• Standard deviation of monthly average daily radiation on a horizontal surface. This parameter gives an idea of

the year-to-year variability of the solar resource at the site.

A2.6 Climate Filenames and Order. Tables A-3, A-5, and A-6 lists the 5564 8118 stations alphabetically, with

the exception that for U.S., and Canadian, and other locations, respectively. are placed first and second in the table.

Climatic design conditions for each location in both I-P and SI units are located online at [link]. The files are named

by the WMO#. Thus, the filenames for Atlanta are 722190_p.pdf for I-P units and 722190_s.pdf for SI units. Users

may also access the files by opening the file named StnList_p.pdf (for I-P units) or StnList_s.pdf (for SI units),

which gives the alphabetical listing of stations and the corresponding WMO#, and then clicking on the WMO# link.

A4. CLIMATE ZONES

© ASHRAE. Per international copyright law, additional reproduction, distribution, or transmission in either print or digital form

is not permitted without ASHRAE's prior written permission.

6 ANSI/ASHRAE Addendum a to ANSI/ASHRAE Standard 169-2013

Tables A-3, A-4, A-5, and A-6 listgive the latitude, longitude, climate zone and weather shielding factor (WSF) and

mean annual precipitation for locations in the United States, Canada, and international locations, respectively. For

locations that are not listed either in Tables A-3, A-5 or A-6, use the Climate Zone Definitions in Section A-3 and

Table A-23 to determine both the climate zone letter and number. Figure A-2 contains the county-level climate zone

map and Table A-4 lists climate zones by state and county for the for the United States. A Python script for

calculating climate zones is included in the online data. Delete existing Table A-1 (I-P and S-I) and replace with following

© ASHRAE. Per international copyright law, additional reproduction, distribution, or transmission in either print or digital form

is not permitted without ASHRAE's prior written permission. ANSI/ASHRAE Addendum a to ANSI/ASHRAE Standard 169-2013 7 TABLE A-1 Design Conditions for Atlanta, GA, USA (I-P) TABLE A-1 Design Conditions for Atlanta, GA, USA (SI)

WMO#:722190

Lat:33.640NLong:84.430WElev:1027StdP:14.16Time Zone:-5.00 (NAE)Period:90-14WBAN:13874 Annual Heating and Humidification Design Conditions

99.6% 99% DP HR MCDB DP HR MCDB WS MCDB WS MCDB MCWS PCWD

( a ) ( b ) ( c ) ( d ) ( e ) ( f ) ( g ) ( h ) ( i ) ( j ) ( k ) ( l ) ( m ) ( n ) ( o ) (1)

1 21.9 26.5 4.9 7.3 29.3 9.3 9.2 32.8 24.8 39.7 23.3 39.2 11.8 320(1)

Annual Cooling, Dehumidification, and Enthalpy Design Conditions DB MCWB DB MCWB DB MCWB WB MCDB WB MCDB WB MCDB MCWS PCWD ( a ) ( b ) ( c ) ( d ) ( e ) ( f ) ( g ) ( h ) ( i ) ( j ) ( k ) ( l ) ( m ) ( n ) ( o ) ( p ) (2)

7 16.7 94.0 74.2 91.6 73.8 89.5 73.3 77.3 88.3 76.3 86.5 75.4 84.8 8.7 300(2)

DP HR MCDB DP HR MCDB DP HR MCDB Enth MCDB Enth MCDB Enth MCDB ( a ) ( b ) ( c ) ( d ) ( e ) ( f ) ( g ) ( h ) ( i ) ( j ) ( k ) ( l ) ( m ) ( n ) ( o ) ( p ) (3)

74.3 133.3 81.3 73.4 128.9 80.3 72.6 125.579.6 41.3 88.3 40.3 86.7 39.5 85.4 82.4(3)

Extreme Annual Design Conditions

1% 2.5% 5% Min Max Min Max Min Max Min Max Min Max Min Max

( n ) ( o ) ( p ) ( b ) ( c ) ( d ) ( e ) ( f ) ( g ) ( h ) ( i ) ( j ) ( k ) ( l ) ( m ) (4)

21.3 18.9 17.0DB15.0 96.6 4.6 3.7 11.6 99.3 8.9 101.4 6.3 103.5 3.0 106.2(4)

(5) WB12.6 79.0 4.4 1.5 9.5 80.1 6.9 81.0 4.4 81.8 1.2 82.9(5)

Monthly Climatic Design Conditions

Annual Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ( d ) ( e ) ( f ) ( g ) ( h ) ( i ) ( j ) ( k ) ( l ) ( m ) ( n ) ( o ) ( p ) (6) DBAvg63.0 44.5 48.0 54.9 62.6 70.5 77.3 80.1 79.5 73.9 63.6 53.5 46.4(6) (7) DBStd14.60 9.66 8.88 9.00 7.40 6.17 4.51 3.50 3.84 5.47 7.07 8.10 8.82(7) (8)

HDD50653 224 132 55 6 0 0 0 0 0 4 56 176(8)

(9) HDD652640 635 477 329 127 25 1 0 0 7 111 352 576(9) (10) CDD505391 54 76 205 385 636 819 933 914 717 425 161 66(10) (11) CDD651901 0 1 14 56 195 370 468 449 273 67 7 1(11) (12) CDH7416445 0 3 103 435 1509 3337 4488 4173 2014 360 22 1(12) (13) CDH806151 0 0 8 66 419 1333 1922 1726 637 40 0 0(13) (14) WSAvg8.2 9.2 9.4 9.5 8.8 7.9 7.3 7.0 6.7 7.5 7.8 8.2 8.9(14) (15) PrecAvg50.80 4.70 4.80 5.80 4.30 4.30 3.60 5.00 3.70 3.40 3.10 3.90 4.30(15) (16) PrecMax64.90 10.20 12.80 11.70 11.90 8.407.40 8.50 8.70 6.10 7.50 7.20 9.90(16) (17) PrecMin37.70 1.70 0.80 2.40 1.50 0.40 1.00 0.70 0.50 0.70 0.10 0.90 0.70(17) (18) PrecStd7.20 2.10 2.70 2.70 2.40 2.30 1.80 2.20 2.20 1.60 2.10 1.60 2.40(18) (19) DB70.5 73.4 80.8 85.0 90.2 94.597.6 97.4 92.8 83.5 77.4 72.3(19) (20) MCWB60.8 61.3 62.6 66.5 71.3 72.974.8 74.3 72.0 68.3 64.1 63.1(20) (21) DB66.3 69.1 76.9 82.0 87.0 92.094.1 93.7 89.0 80.9 73.3 68.6(21) (22) MCWB58.7 58.8 60.6 64.9 69.8 72.974.7 74.6 71.4 66.7 61.8 61.6(22) (23) DB63.0 65.9 73.5 79.2 84.6 89.891.6 90.9 86.4 78.2 70.3 64.6(23) (24) MCWB57.2 56.9 59.1 63.4 68.8 72.574.3 74.2 70.7 64.7 60.6 59.0(24) (25) DB59.5 62.7 69.8 76.1 82.1 87.489.1 88.3 83.8 75.3 67.1 60.9(25) (26) MCWB53.9 54.5 57.7 61.8 67.8 71.974.2 73.4 70.2 64.1 58.4 55.2(26) (27) WB64.2 65.5 66.4 70.8 74.9 77.378.9 78.4 76.4 72.0 69.2 66.7(27) (28) MCDB67.5 67.9 72.8 79.2 83.3 88.489.6 89.9 86.1 78.8 71.8 69.8(28) (29) WB61.6 62.4 64.1 68.3 72.7 75.977.5 77.2 74.6 70.2 66.1 63.5(29) (30) MCDB64.6 66.6 71.5 76.3 82.3 86.588.3 88.4 83.2 75.9 70.0 66.4(30) (31) WB58.6 59.5 62.1 66.4 71.3 74.976.5 76.2 73.5 68.7 63.5 60.3(31) (32) MCDB61.9 64.0 70.0 74.4 80.6 85.086.7 86.1 80.9 73.8 67.7 64.1(32) (33) WB55.2 56.3 60.0 64.5 69.9 73.875.4 75.2 72.6 66.9 60.5 56.3(33) (34) MCDB58.3 60.6 67.0 72.3 78.6 83.184.9 84.2 79.5 72.3 65.4 59.8(34) (35) MDBR17.3 18.2 19.2 19.8 18.2 17.216.7 16.4 16.5 18.1 18.7 16.6(35) (36) MCDBR19.5 20.9 22.5 22.0 20.1 20.120.2 19.5 19.1 20.4 20.9 19.5(36) (37) MCWBR13.6 13.3 11.0 9.5 7.5 6.6 6.1 6.0 6.8 8.9 11.7 13.2(37) (38) MCDBR16.0 17.5 17.9 18.2 17.3 17.317.5 16.8 15.3 14.9 16.8 16.8(38) (39) MCWBR13.2 13.8 11.0 9.8 7.7 6.9 6.4 6.1 6.9 8.9 12.9 13.6(39) (40)

0.310 0.315 0.347 0.386 0.440 0.4730.515 0.515 0.417 0.363 0.333 0.311(40)

(41)

2.538 2.521 2.453 2.324 2.213 2.1682.066 2.052 2.312 2.460 2.484 2.554(41)

(42)

288 298 295 286 270 260 249 246 268 277 276 281(42)

(43)

26 29 34 40 46 48 53 52 39 31 27 24(43)

(44)

852 1054 1407 1751 1904 1954 1858 1726 1496 1275 963 738(44)

(45)

50 122 109 126 164 162 134 103 148 163 82 73(45)

ATLANTA HARTSFIELD-JACKSON, GA, USA

Temperatures,

Degree-Days

and

Degree-HoursHottest

Month

DB RangeCooling DB/MCWB Evaporation WB/MCDB

0.4% 1%

1% 2%

1% 2%0.4%Coldest

Monthquotesdbs_dbs25.pdfusesText_31

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