Think of what winter does to a place: the sky goes grey, the trees go bare, the light gets thin, and nobody stays outside. Wintry is that whole picture in one word — not only the low temperature, but the emptiness that comes with it. Once you can see the picture, it is easy to see why it can be laid over a person's face.
wintry 可以想成「一身冬天味」。天空是灰的，樹是光的，光線很淡，東西看起來都沒有溫度，路上也沒什麼人。這個字講的不只是溫度低，還有那種蕭索、沒有生氣的感覺。畫面一旦成形，它就不必只留在天氣上——同樣的冷和空，也可以直接貼到一個人的臉上。
From the word’s history
The source gives it as winter + -y, noting that Old English had a parallel form wintriġ. The suffix -y turns a noun into an adjective meaning full of that thing, so the word is literally full of winter.
來源說這個字是 winter 加上字尾 -y，並提到古英文也有 wintriġ 這個平行形式。-y 把名詞變成形容詞，意思是「帶有那個東西」。所以 wintry 字面上就是「滿是冬天」，這正好就是它的核心畫面。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:860358100:31258)
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