Wiktionary
n. (context British English) Undesirable weather, especially foggy or stormy weather conditions.
Usage examples of "dirty weather".
Captain Palmer had watched them, had seen the grey blur of rain beneath them and judged that by this night the Teste de Buch would once again be crouching beneath dirty weather.
Four dirty weather-stained canvas sacks of mail were heaped on the deck at his feet.
Oh, not literally, but in dirty weather like this we have to worry about that, too: can't spot anything till it's right on top of you.
In this rough clothing, with a common mariner's telescope under his arm, and a shrewd trick of casting up his eye at the sky as looking out for dirty weather, he was far more nautical, after his manner, than Mr.
There's dirty weather coming by the feel of it, and it's my guess that they won't wait.
The red sky just before the sun rose above the horizon told the experienced men that ere long dirty weather would set in as clearly as if they had been provided with the most delicate barometric appliances.
Imagine him taking the middle watch in dirty weather on a lee-shore - imagine sending him away with the boats on a cutting-out expedition - that would be sporting with men's lives indeed.