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Environment, Weather, and Green Living
Reply to "How can I predict when it's going to be frosty in the morning?"
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[quote=Anonymous]Generally speaking, frost forms when the temperature is below freezing and meets the dew point (relative humidity = 100%). It's the high relative humidity that results in either condensation (dew, when it's above freezing) or deposition (frost, when it's below freezing). If the temperature is below freezing, but the dew point is even lower (low relative humidity), frost isn't likely to form. There are details like wind and cloud cover that can make a difference when it's close, but you can get a pretty good idea by checking the forecast for both the temperature and dew point (or relative humidity).[/quote]
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