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.