noun
wintry sky; cold winter weather
Refers to the cold-looking sky or the cold weather typical of winter. Often used in descriptive or literary contexts.
寒空の下、子供たちは元気に遊んでいた。
Under the wintry sky, the children were playing energetically.
今日は一段と寒空で、コートが手放
It's especially cold winter weather today; I can't go without a coat.