Having lived in southern California, I know that some areas on the planet can be absurdly sunny and clear throughout the year, and having lived several other places, I know some areas can be chronically overcast.
The article Laser Light to leverage free-space optics in space for Optical Satellite as a Service describes a proposed group satellites in medium Earth orbit (MEO) that would maintain high speed optical data links with a large number of Earth stations. I did some further reading, and found the map shown below. I assume this is still conceptual and the final ground station locations may be different.
But I am wondering, besides that one station in southern California, do these appear to be in meteorologically favorable locations for continuous optical data links to satellites? Are these particularly sunny/clear sky locations?
Does a map of clear-sky hours per year - independent of day or night - exist?
As pointed out in this comment and this article the network can work by reconfiguring depending on atmospheric conditions. But do these appear to be chosen by access to clear skies, or access to fiber networks?