How to generate a DDY file for Openstudio/Energyplus

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The Weather converter program normally creates a DDY file containing SizingPeriod:DesignDay objects with data from the ASHRAE Handbook of Fundamentals 2009. Since no data is available for your location, you can use the use the data that is shown in the STAT file that is also generated to create SizingPeriod:DesignDay objects by hand. The AuxiliaryProgram documentation states:

Using the WMO field (or determining it from the WBAN field), the Weather Converter performs table look up in the Design Condition files to see if there are recorded design conditions for the subject location. If this location is found, then design day objects are produced on the resultant design day object (ddy extension) file – ready for inclusion into an EnergyPlus input data file. If no design conditions are located, then the design day object file will still include a location object for inclusion with EnergyPlus. However, statistics using the weather file are displayed to the statistics file – these “can” be used to create your own design day definitions but you should read the warning that is issued and take care if your weather file is only a “single instance” weather data representation.

Another option is to choose design day data from a location that is most similar, perhaps by comparing data from the STAT file. I would also suggest that you contact the vendor that provided you the data and see if they can provide design day data.