== Antarctica Humidity ==
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... the average values of absolute humidities at Vanda were calculated to be about (1.5e-3 to 2.6e-3 kg/m3 in summer, and about 0.14e-3 to 0.22e-3 kg/m3 in winter.   Vanda Station is at 77.5 degrees south, on the coast near New Zealand, not the the ultra-dry interior. http://www.victoria.ac.nz/antarctic/pdf/ADS10.pdf  

Vostok Station at 3488 m, 78°27' S  106°52' E  is higher, colder, and drier. http://www.aari.aq/stations/vostok/vostok_en.html

||        || Pressure || Temperature || Humidity ||
|| Winter || 623.1 mb || -65.0 C     || 0.01 mb  ||
|| Summer || 638.6 mb || -30.9 C     || 0.37 mb  ||

1 mb (millibar) is 100 Pascals, or about 10.2 kg/m3 of water.

The Sahara desert is about 1e-3 kg/m3 (8mm or 8 kg/m3 of water).