With my Indoor/Outdoor weather station, if the remote sensor is sitting indoors by the main interior display unit, the temperature readings are synchronized perfectly to 0.1 Fahrenheit. The humidly values almost match but are not perfectly synchronized.
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But then if I move both units outside on a 56 degree morning, the "indoor" humidity readying is about 15% higher than the "remote" reading. Again the two sensors are side-by-side, but outdoors.
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Why don't the % values approximately match when both sensors are outside in the cold. (they match when they are both inside) Does this mean the displayed values are somehow "calculated" but the assumptions in the formula are wrong if both sensors are outside ?
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I am not a dewpoint or humidity scientist . . so please explain in layman's terms.