in my experience its more like: 0-5% - Sunny; 5-60% - Partly Cloudy; 60-100% - Cloudy;

I've not seen other descriptors, and to view it changing over time its just on the timeline as a sun, sun+cloud & cloud emoji's

It's not useful other than as a binary 'is it cloudy' which in Bay Area weather it is a meaningful difference between 30% and 60% coverage

The best cloud cover that I've found is yr.no

For example (and it always takes a bit for me to find it) https://www.yr.no/en/details/table/2-4887398/United%20States... (and https://www.yr.no/en/details/graph/2-4887398/United%20States... )

And here's their API - https://developer.yr.no/featured-products/forecast/

It breaks it down by overall, low, medium, and high clouds.

At the fringes, there is a meaningful difference. The center 50%, not really.

A 95% coverage day is a bit different than a 100% coverage day. Particularly, when it comes to rain and wind expectations.

How is that difference meaningful? What actions are you going to take differently at 95% cloud coverage vs 100%? I can't think of anything I'd do differently if I was expecting 100% cloud coverage tomorrow to wake up and find that it was actually at 95%.

Yeah, and I’d argue that if the difference is meaningful to you, then you probably want something more accurate than what a consumer-grade weather service can provide. So it would be borderline irresponsible of Apple to even give you the false confidence of some precise measurement of cloud cover.

I would expect certain segments of aviation to find the additional granularity critical.

Presumably they shouldn’t be using a consumer weather service and mobile app.