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 | | Since the dew point is a measure of the amount of moisture in the air, it is a good indicator of the likelihood of fog as well as the probability of thunderstorms during the summer. |
 | | Since the saturation vapor pressure of air decreases with temperature, cooling the air without adding or removing water vapor results in a higher relative humidity (that is, the air is closer to being saturated), although at low temperatures, the actual amount of water vapor in the air would remain low. |
 | | When the dew point is close to the air temperature, there is a lot of water vapor in the air (leading to muggy conditions), and this keeps the temperatures from dropping significantly overnight. |
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