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Energy plus comes with a free weather file editing tool called "Weather Statistics and Conversions". What I usually do is convert a weather file from the closest weather station from .epw to .csv. I then take the actual weather data I have and replace it in the .csv file. Normally I only have DB, WB, Dew Point, Humidity Ratio. I then use the same tool to convert the .csv file back to .epw or .bin for use in energy analysis programs. The only issue with this method is that the solar data comes from the original weather file and it is not the actual solar data.

Energy plus EnergyPlus comes with a free weather file editing tool called "Weather Statistics and Conversions". What I usually do is convert a weather file from the closest weather station from .epw to .csv. I then take the actual weather data I have and replace it in the .csv file. Normally I only have DB, WB, Dew Point, Humidity Ratio. I then use the same tool to convert the .csv file back to .epw or .bin for use in energy analysis programs. The only issue with this method is that the solar data comes from the original weather file and it is not the actual solar data.