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Cold, continental polar air is often described as being very dry even when its relative humidity is very high. This is due to the temperature of the polar region being close to the dew point temperature.
In cold, polar air, the dew point and air temperature are normally close. But the low dew-point temperature means there's little vapor within the air. Consequently, the air is "dry" although the relative humidity is high.
The vapor content is additionally low within the air, the water vapor capacity is low furthermore. This causes the saturation of air that's holding very small amounts of water vapor even when the air is dry relatively. As a result, the relative humidity is higher within the polar region.
Relative humidity could be a measure of the particular amount of water vapor within the air compared to the whole amount of vapor that may exist within the air at its current temperature.
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