Weather statistics file is blank

Mo · May 7, 2025, 4:19pm

I used the templated Honeybee project even to make sure that it was not something specific with my model or script, the output table is blank. And just to clarify, the stat file is in the same location as the epw file. Also the same happens in OpenStudio, same output, everything is there except for the weather stats. Also this has been tested for multiple locations and weather files, same output.

chris · May 7, 2025, 5:05pm

Hey @Mo ,

I don’t know much about that section of the E+ HTML report.

Was this chart in the E+ summary ever anything different than what you show in your screenshot? That is, was there some change that we might have made, which caused this chart to be blank?

Mo · May 7, 2025, 6:48pm

Hey @chris , thanks for replying. That section of the report was usually populated in older versions. Since I upgraded to the new OpenStudio and I wanted to run the ASHRAE 90.1-2019 PRM measure (Getting Started : OSSTD doc) I get an error in translation after the successful simulation and generation of the baseline JSONs “Python310\site-packages\energyplus_rpd\translator.py”, line 392, in add_weather
climate_zone = rows[‘ASHRAE Climate Zone’][0]
KeyError: ‘ASHRAE Climate Zone’" upon investigation I found that table missing from the outputs and it seems like the measure is calling it out

chris · May 7, 2025, 7:09pm

Thanks for clarifying, @Mo .

This seems like a limitation of all of the new changes that we made to the OpenStudio workflows. I should be able to fix it if I can understand it better.

We try to assign the ASHRAE climate zone using the STAT file next to the EPW in this part of the new “Model to OSM” component:

github.com

ladybug-tools/honeybee-grasshopper-energy/blob/master/honeybee_grasshopper_energy/src/HB Model to OSM.py#L203-L207


      
          if sim_par.sizing_parameter.climate_zone is None:
              stat_file = os.path.join(folder, epw_file_name.replace('.epw', '.stat'))
              if os.path.isfile(stat_file):
                  stat_obj = STAT(stat_file)
                  sim_par.sizing_parameter.climate_zone = stat_obj.ashrae_climate_zone

… and, if it doesn’t get assigned there, it is supposed to be set by looking over the timeseries data in the EPW:

github.com

ladybug-tools/honeybee-openstudio/blob/master/honeybee_openstudio/simulation.py#L59-L61


      
          if not cz_set:  # use temperature in the EPW to estimate the climate zone
              epw = EPW(full_path)
              climate_zone_objs.setClimateZone('ASHRAE', epw.ashrae_climate_zone)

Can you share the URL to the weather data that you are using so that I can see if I can recreate your issue?

chris · May 7, 2025, 7:30pm

Hey @Mo ,

I just ran a test with setting everything back to OpenStudio 3.7 and, as far as I can tell, that “Weather Statistics File” table has always been empty for all versions of Ladybug Tools.

If you have any ideas for how we can get it to work, I’m happy to implement them.