Question-and-Answer Resource for the Building Energy Modeling Community
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It took a bit of backtracking, but I finally found an old 2015 version of the calcdsntempAEC.program I wrote that included the dual set of numbers, and even then they had been commented out! I had written the calcdsntempAEC program to calculate the DDY files so that they would be consistent with the CZ2010 weather files.
During development I added a lot of debug statements to make sure the values are correctly calculated, and the two variables you pointed out with duplicate numbers (Wind Speed and Mean Coincident Wet Bulb) were case where I had inadvertently left in the second debug output. Base don reading the program code, the first number is the one that should be used, while the second number is a debug value calculated in a different way. Most of the time the two are either the same or within a point of each other.
I could only find such DDY files for the CZ2010 weather files. I've corrected all 86 of the CZ2010 zip files, so if you were to download the files again, the DDY files should no longer show the duplicate numbers.
Joe
