I am trying to create my own EPW file for the first half of 2021.
I have all variables except for Horizontal Infrared Radiation Intensity or Opaque Sky Cover (I need at least one to complete my file).
Is there any method I can use to derive either variable? Or is there a satellite, bureau of meteorology database etc anyone is aware of that I could source this data from?
Thank you for any help you can provide.