Updated Canadian CWEC Weather Files

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Hello all,

The government of Canada seems to have updated their engineering climate data sets to be used for energy simulations. The new data sets can be found here:

http://climate.weather.gc.ca/prods_servs/engineering_e.html

I quickly compared a CWEC file available from the doe2 website with the latest CWEC_V_2016 file from the website above for the same city and sure enough the number of heating degree days have been reduced and cooling degree days have gone up.

The issue I have with these files is I can?t seem to determine what years they are based on. The text files available on their ftp site are outdated (they maintain the CWEC files are based on data from 1960-1989), and the descriptions on the website are ambiguous.

Given the recent flurry of activity on weather files, I figured someone would be able to answer this pretty quickly!

Many thanks,

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Jason Ng_ing. M.Sc.A.
jng at bpa.ca | www.bpa.ca | t: 5143833747x2813

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jng
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According to the last documentation (see attached Release 9 dated Oct. 23 2008, see
Appendices D and E at the end), the periods of record vary from place to place, but most
end in 1989.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"

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Hi Joe,

Thanks for the swift reply.

Indeed, this was the documentation I was referring to in my email. The documentation was published in 2008 whereas the CWEC files were uploaded to their ftp site in July 2017. I had a feeling they simply did not update the documentation when they updated the CWEC files so I wanted to confirm the dates used directly in the files somehow. Is this not possible?

[Bouthillette Parizeau]

Jason Ng_ing. M.Sc.A.
jng at bpa.ca | t: 5143833747x2813

De : Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] De la part de Joe Huang via Equest-users
Envoy? : 11 janvier 2018 11:37
? : equest-users at lists.onebuilding.org
Objet : Re: [Equest-users] Updated Canadian CWEC Weather Files

According to the last documentation (see attached Release 9 dated Oct. 23 2008, see Appendices D and E at the end), the periods of record vary from place to place, but most end in 1989.

Joe

Joe Huang

White Box Technologies, Inc.

346 Rheem Blvd., Suite 205A

Moraga CA 94556

yjhuang at whiteboxtechnologies.com

http://weather.whiteboxtechnologies.com for simulation-ready weather data

(o) (925)388-0265

(c) (510)928-2683

"building energy simulations at your fingertips"

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jng
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Go to this site:
http://climate.weather.gc.ca/prods_servs/engineering_e.html

Select ?Canadian Weather Year for Energy Calculation (CWEC) to get to the site with the weather files:
ftp://ftp.tor.ec.gc.ca/Pub/Engineering_Climate_Dataset/Canadian_Weather_year_for_Energy_Calculation_CWEC/ENGLISH/

The release notes haven?t been updated to reflect the latest set of CWEC files. Select CWEC_v_2016.

In the zip file for each province is the latest set of CWEC files in pairs ? the .epw file and the .wy3 file. The .wy3 file lists the year used for each month of data. For example, the Charlottetown, PEI file uses data from 1999 to 2013.

Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

[cid:image002.png at 01D38AD1.F446B970]
T +1 416-644-0252

2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada

wsp.com

Please consider the environment before printing...

Jones, Christopher2's picture
Joined: 2017-10-12
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Ah Thanks Chris!

I opened the .epw files but didn?t bother checking the wy3 files for the dates as I figured they were identical. This confirms my theory that the documentation is not up to date!

Thanks,

[Bouthillette Parizeau]

Jason Ng_ing. M.Sc.A.
jng at bpa.ca | t: 5143833747x2813

De : Jones, Christopher [mailto:Christopher.r.Jones at wsp.com]
Envoy? : 11 janvier 2018 11:52
? : Ng, Jason
Cc : equest-users at onebuilding.org
Objet : RE: Updated Canadian CWEC Weather Files

Go to this site:
http://climate.weather.gc.ca/prods_servs/engineering_e.html

Select ?Canadian Weather Year for Energy Calculation (CWEC) to get to the site with the weather files:
ftp://ftp.tor.ec.gc.ca/Pub/Engineering_Climate_Dataset/Canadian_Weather_year_for_Energy_Calculation_CWEC/ENGLISH/

The release notes haven?t been updated to reflect the latest set of CWEC files. Select CWEC_v_2016.

In the zip file for each province is the latest set of CWEC files in pairs ? the .epw file and the .wy3 file. The .wy3 file lists the year used for each month of data. For example, the Charlottetown, PEI file uses data from 1999 to 2013.

Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

[cid:image002.png at 01D38AD3.91F19EA0]
T +1 416-644-0252

2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada
wsp.com

Please consider the environment before printing...

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jng
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It's just occurred to me that you were asking for the periods of record
for the NEW CWEC, whereas I thought you were asking about the earlier
CWEC2!

I haven't looked at the new CWEC, but the epw format should also so the
years for each historical month.? Having said that, looking at the years
on the files does not give you an accurate reading of the period of record.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com for simulation-ready weather data
http://www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"

Joe Huang's picture
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Joined: 2011-09-30
Reputation: 206