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How can the humidity be 100% without it raining?

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The percentage of humidity is not measured by the ratio of water to air. Instead, it looks at how much water vapor the air can hold at a certain temperature. When the humidity is at 100 percent, it's holding the absolute maximum; that means no more water can evaporate because the atmosphere has reached its limit. read more

Therefore, at greater than one hundred percent humidity, it starts to separate out as precipitation or condensation on cool things. At one hundred percent humidity, sweat and puddles no longer evaporate. The air can never be 100% water, because at that point you'd be underwater and you'd drown. read more

A relative humidty measurement of 100% does not necessarily mean that rain is falling. It just means that the air is holding as much moisture as it can at a given temperature, in the form of water vapor, which is an invisible gas. read more

humidity measures moisture in the air. But it can be raining without 100 percent humidity. And, the humidity can measure 100 percent without it raining. For clouds to form and rain to start, the air does have to reach 100% relative humidity, but only where the clouds are forming or where the rain is coming from. read more

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