The word(s) "sky" appears 49 time(s) in 47 verse(s) in Quran in Mohsin Khan translation.

(21) Do they not see the birds held (flying) in the midst of the sky? None holds them but Allah [none gave them the ability to fly but Allah]. Verily, in this are clear Ayat (proofs and signs) for people who believe (in the Oneness of Allah).

(22) "Or you have a house of Zukhruf (like silver and pure gold), or you ascend up into the sky, and even then we will put no faith in your ascension until you bring down for us a Book that we would read." Say (O Muhammad صلى الله عليه و سلم): "Glorified (and Exalted) be my Lord [(Allah) above all that evil they (polytheists) associate with Him]! Am I anything but a man, sent as a Messenger?"

(23) "It may be that my Lord will give me something better than your garden, and will send on it Husban (torment, bolt) from the sky, then it will be a barren slippery earth.

(24) And put forward to them the example of the life of this world: it is like the water (rain) which We send down from the sky, and the vegetation of the earth mingles with it, and becomes fresh and green. But (later) it becomes dry and broken pieces, which the winds scatter. And Allah is Able to do everything.

(25) Who has made earth for you like a bed (spread out); and has opened roads (ways and paths) for you therein, and has sent down water (rain) from the sky. And We have brought forth with it various kinds of vegetation.

(26) Hunafa' Lillah (i.e. worshiping none but Allah), not associating partners (in worship) unto Him; and whoever assigns partners to Allah, it is as if he had fallen from the sky, and the birds had snatched him, or the wind had thrown him to a far off place.

(27) See you not that Allah sends down water (rain) from the sky, and then the earth becomes green? Verily, Allah is the Most Kind and Courteous, Well-Acquainted with all things.

(28) And We sent down from the sky water (rain) in (due) measure, and We gave it lodging in the earth, and verily, We are Able to take it away.

(29) See you not that Allah drives the clouds gently, then joins them together, then makes them into a heap of layers, and you see the rain comes forth from between them; and He sends down from the sky hail (like) mountains, (or there are in the heaven mountains of hail from where He sends down hail), and strikes therewith whom He wills, and averts it from whom He wills. The vivid flash of its (clouds) lightning nearly blinds the sight. [Tafsir At-Tabari].

(30) And it is He Who sends the winds as heralds of glad tidings, going before His Mercy (rain); and We send down pure water from the sky.