Posted by admin | Posted in Thermo Hygrometers | Posted on 05-08-2005
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How can you have a negative humidity?
Both wunderground.com and my professional weather station show a negative humidity for my city (Escondido, CA.) How is this possible?
They are probably measuring dew point... the temperature the atmosphere needs to cool off to for dew (or fog) to from. That is measured in degrees much like the temperature so it is possible for it to drop below 0. I doubt that there is any technical glitch since 2 reliable source report the negative values.
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