It was a cloudy day with variable winds.

那是一个风向变化不定的阴天。

youdao

We are able to do only a number of days out at a time because the winds are so variable this time of year.

WHITEHOUSE: Press Briefing on Oil Spill in Gulf of Mexico

Second, offshore winds, though variable, are fairly predictable.

ECONOMIST: Offshore energy: I'll huff and I'll puff | The