If it’s any help, I’ve set up a home made night cloud sensor using a Davis temp sensor in a jar today.
It’s on test overnight to see what readings I get from it but I’ve initially set it up at 0.1 for overcast and 2.1 for clear sky. As it got dark this evening it went from “Overcast Night”, “Mostly Cloudy Night” to “Cloudy Night” and then back to “Overcast Night”. So the description is working on my version of WD, which is 10.37S Build 53.
This is a learning curve for me while I figure it out, so I’m not sure what’s correct yet.
At the time of typing, the outside air temp is 10.3