空がだんだん曇ってきた。

空がだんだん曇ってきた。

The sky has gradually clouded over.

空(そら)がだんだん曇(くも)ってきた。

Sora ga dandan kumottekita.

空 (そら)

sky; the heavens

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

段々 (だんだん)

gradually; by degrees; steps; stairs; staircase; terrace

曇る (くぐもる)

to mumble; to mutter

Readings: クウ、そら、あ.く、あ.き、あ.ける、から、す.く、す.かす、むな.しい

Meanings: empty, sky, void, vacant, vacuum

Readings: ドン、くも.る

Meanings: cloudy weather, cloud up