Atmospheric water vapour decreases rapidly with increasing altitude relative to its surface value. The amount of water required to saturate a volume of air depends on the temperature of the air. Air at high temperature can hold more water vapour at saturation than can air at low temperature.

Gaseous water represents a small but environmentally significant constituent of the atmosphere. The percentage water vapor in surface air varies from 0.01% at -42 °C (-44 °F) to 4.24% when the dew point is 30 °C (86 °F). Approximately 99.13% of it is contained in the troposphere.

Answer. At high altitudes, Air density is less and thin. Water vapour amount is decreased since water vapours are heavier and heavy things are pulled down and lighter things float above it. Water vapour are therefore more active at low altitudes.In other words water vapours depend upon density of air and temperature.

Do you know the humidity level of your house? The ideal percentage of relative humidity (RH) indoors should be around 50% in the summer and 30% in the winter. Too much or too little humidity can lead to complications that are sometimes significant.

When weather fronts come in off the warm waters, it gets very hot, and very sweaty. The highest ever recorded was Dhahran in Saudi Arabia in 2003, when the ultra-high humidity made 42 degrees Celsius feel like 81 degrees.

The rest of the top ten least humid cities hang together in the range of 63 to 66 percent humidity….Cities With Low Humidity in the USA.

Here are the four best states for a low-humidity retirement.

1. Nevada. Not surprisingly, a state known for its desert climate is a place with low humidity.
2. Arizona. Like Nevada, Arizona offers an arid climate, and it also has many more active adult communities.
3. Colorado.
4. New Mexico.
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