Cloud "greyness" in daily predictions

[obones]

Hello,

I'm using open-meteo data inside my home automation system which pushes weather representation to a nice panel.
On this one, I display icons for the forecast daily weather based on the Weather code which is fine, but I'm wondering if could get the cloud icons more precise by filling them with a gray level that goes from white cloud to very dark storm clouds.

Clearly, this is not something that is directly available, but I'm wondering if you would have suggestions as to how I could reconstruct this, either from daily forecast variables, or by aggregating hourly forecast variables.

Any suggestion is most welcome.

[patrick-zippenfenig]

Would the variable cloud_cover work? 100% is "only" overcast and not storm, but otherwise this is the simplest way to get a fractional cloud value.

[obones]

That would be fine indeed.
Should I simply average the cloud_cover value over the 24 hours of a given day?

[patrick-zippenfenig]

Yes, you can average cloud cover for a day, or you could only consider hours between 6:00 and 18:00