The word(s) "sky" appears 53 time(s) in 51 verse(s) in Quran in Muhammad Pickthal translation.

(31) And of His signs is this: He showeth you the lightning for a fear and for a hope, and sendeth down water from the sky, and thereby quickeneth the earth after her death. Lo! herein indeed are portents for folk who understand.

(32) Allah is He Who sendeth the winds so that they raise clouds, and spreadeth them along the sky as pleaseth Him, and causeth them to break and thou seest the rain downpouring from within them. And when He maketh it to fall on whom He will of His bondmen, lo! they rejoice;

(33) He hath created the heavens without supports that ye can see, and hath cast into the earth firm hills, so that it quake not with you; and He hath dispersed therein all kinds of beasts. And We send down water from the sky and We cause (plants) of every goodly kind to grow therein.

(34) Have they not observed what is before them and what is behind them of the sky and the earth? If We will, We can make the earth swallow them, or cause obliteration from the sky to fall on them. Lo! herein surely is a portent for every slave who turneth (to Allah) repentant.

(35) Say: Who giveth you provision from the sky and the earth? Say: Allah, Lo! we or you assuredly are rightly guided or in error manifest.

(36) O mankind! Remember Allah's grace toward you! Is there any creator other than Allah who provideth for you from the sky and the earth? There is no Allah save Him. Whither then are ye turned?

(37) Hast thou not seen that Allah causeth water to fall from the sky, and We produce therewith fruit of divers hues; and among the hills are streaks white and red, of divers hues, and (others) raven-black;

(38) Hast thou not seen how Allah hath sent down water from the sky and hath caused it to penetrate the earth as watersprings, and afterward thereby produceth crops of divers hues; and afterward they wither and thou seest them turn yellow; then He maketh them chaff. Lo! herein verily is a reminder for men of understanding.

(39) He it is Who showeth you His portents, and sendeth down for you provision from the sky. None payeth heed save him who turneth (unto Him) repentant.

(40) Allah it is Who appointed for you the earth for a dwelling-place and the sky for a canopy, and fashioned you and perfected your shapes, and hath provided you with good things. Such is Allah, your Lord. Then blessed be Allah, the Lord of the Worlds!