Tuesday was a fine, clear and calm day.

星期二是晴空万里、风和日丽的一天。

《柯林斯英汉双解大词典》

It's a calm day today.

今天又是个平静的一天。

youdao

On a calm day, the sea laps on the rocks.

风平浪静时，海水轻轻拍打着岩石。

youdao

An uncharacteristically calm day on the Atlantic coast rendered its impact virtually obsolete but it looked great!

BBC: Matt Roberts' Estoril MotoGP column

Monster Beverage was an even more extreme example of such swings Monday abroad a relatively calm day for the broader market, surging almost 25% before plunging back into the red.

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Today was a pretty calm day.

WHITEHOUSE: Press Briefing with President Obama and President Clinton