snow-laden sky; sky heavy with snow
Describes a winter sky that looks like it is about to snow, or is already snowing. Often used in poetic or descriptive contexts.
Under the snow-laden sky, snow began to fall quietly.
Compound of 雪 (yuki, 'snow') and 空 (sora, 'sky'), with rendaku voicing of sora to zora. The exact historical derivation is uncertain, but the word is transparently formed from its components.