Despite what the dictionary said, I think I'd rarely (if ever) use the verb lack in this context.
The word lack is usually reserved for when there's not enough of something – like money or food. In the case of weather, we don't typically need to have a certain number of clouds in the sky, although you might say:
The desert lacks the rain needed for ferns to grow.
It's interesting how Google turned up only 10 hits for
"The sky lacks clouds". Change that to
"No clouds in the sky", however, and you'll get scores of hits.
Also, you definitely would not want to say "Clouds lack from the sky." Generally speaking, it's the company or individual that lacks the resource, not the other way around:
- Our company lacks the funding to complete the project (not The funding lacks our company)
- Students leaving college may lack the skills they need to get a high-paying job