The phrase "it's humidity" is grammatically correct and can be used in written English.
It means that there is a high level of moisture in the air. You can use this phrase in a sentence when discussing the weather or describing the current climate. Example: "As we stepped outside, we could feel the heaviness in the air - it's humidity was almost suffocating."
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It's humidity makes us unhappy.
"It would be very similar to the way we sell cigars, where it's humidity controlled, where it's under lock and key and there are certain times when it would be sold," said Mr. Hennessy, 63, who markets his own wine and once led the California Retail Liquor Dealers Association.
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"The only thing that will really hurt it is humidity," he said in a telephone interview.
Still, the glimpses that we did get of Beijing were fascinating, right down to the gray-green haze that pervaded the city for the first few days of the Games (it brought out the amateur meteorologist in us, trying to figure out how much of it was humidity and how much was pollution).
"Sometimes if there's humidity, it gets buggy," Mr. Rendell said, to groans and laughter from the audience.
Its not the heat, it's the humidity.
"It's the humidity," Everett said.
"No, it's the humidity," Bob counters.
The problems were not strictly seasonal, he said: "Sometimes down here we have a more humid period in the fall or winter, but you don't notice it as much when it's 85percentt humidity and 50 degrees".
Some say the world will end in fire, others say ice — but it's the humidity that'll do us in, according to a new study.
Hot as it was, the humidity -- and only average humidity, at that -- made it feel worse.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com