[Bldg-sim] Revised TMY3 Weather Files now available on the Web

Jim Dirkes jim at buildingperformanceteam.com
Mon Feb 9 12:56:51 PST 2015

Wet Bulb is not part of the weather files I'm familiar with.  Dry Bulb and
Dewpoint are normally goven, though, and you can derive WB from those two

On Mon, Feb 9, 2015 at 3:33 PM, RobertWichert <robert at wichert.org> wrote:

>  These weather files are great, thanks for the info, but I am trying to
> get wet bulb temperature too, and they do not seem to give wet bulb
> temperatures.
> Any ideas on that, perhaps?
> --
> Robert P. Wichert P.Eng.  LEED AP
> CEPE  CEA  HERS I/II BPI BA+1 916 966 9060
> FAX +1 916 966 9068
> ========================================
> On 1/30/2015 9:10 PM, Joe Huang wrote:
> White Box Technologies (WBT), in collaboration with the National Renewable
> Energy Laboratory (NREL), has revised the TMY3 weather files to correct
> inconsistencies in units for illuminances, improve the reporting of Liquid
> Precipitation, replace all missing records with interpolated or filled
> values (chiefly for visibility, ceiling height, aerosol optical depth, and
> albedo), and add a new variable for Present Weather.
> Since their release in 2005, the TMY3 weather files covering 1,020
> locations in the US and dependencies has become the standard set of weather
> files for use in computer simulations of solar energy conversion systems
> and buildings. The intent of this revision is not to redo the fundamental
> analysis, but correct some known errors and make modest improvements in the
> reporting of subsidiary climate variables.
> The only impact from these corrections and changes are for daylighting
> simulations that use the illuminance values, and for building simulations
> that use the liquid precipitation to model green roofs or moisture
> transport through the building envelope. The added Present Weather variable
> is not directly used in any simulation program, but allows the DOE-2 BINM
> files to have correct IRAIN and ISNOW flags, although these two variables
> are not being used in DOE-2.  Filling in missing data for Visibility,
> Ceiling Height, etc., should have no impact on the use of the TMY3s, but
> improves their overall record-keeping.
> The revised TMY3 files in their native CSV format have been provided back
> to NREL and are available here:
> http://rredc.nrel.gov/solar/old_data/nsrdb/1991-2005/tmy3
> The revised TMY3 files in EPW and BINM formats are available for free
> download on the White Box Technologies web site at
> http://weather.whiteboxtechnologies.com/wd-TMY3 or by selecting File Type
> as "TMY3" at http:/weather.whiteboxtechnologies.com/search to search
> using GoogleEarth. The zip file names are unchanged, but the underlying EPW
> and DDY files will have the *TYA designation to distinguish them from the
> previous TMY3 versions.
> For a more detailed description and full documentation of the revision,
> please see the attached memorandum.
> 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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James V Dirkes II, PE, BEMP, LEED AP
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504

Direct: 616.450.8653
jim at buildingperformanceteam.com

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 The truth is like a lion; you don’t have to defend it. Let it loose; it
will defend itself.
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