https://www.wunderground.com/cat6/world-record-low-humidity-116f-036-humidity-iran

This may be a world record of the lowest humidity ever observed. ... Iran, where the temperature hit 46.5°C with a -33.2°C dewpoint at 12 UTC, giving this city ... This was the lowest humidity in world recorded history that Herrera was aware of;  ...

https://www.wunderground.com/blog/weatherhistorian/record-dew-point-temperatures.html

Aug 11, 2011 ... This would also be one of the highest dew points ever observed in the ... the ground and lowest levels of the atmosphere whereas other more ... In fact, the hottest sea surface temperatures ever recorded anywhere in the world ...

https://en.wikipedia.org/wiki/Dew_point

The dew point is the temperature to which air must be cooled to become saturated with water .... at Dhahran, Saudi Arabia, at 15:00 AST on July 8, 2003, which caused the heat index to reach 81 °C (178 °F), the highest value recorded.

https://www.chicagotribune.com/news/weather/ct-wea-asktom-0827-20170825-column.html

Aug 25, 2017 ... The world's highest reported dew point is 95 degrees, recorded on July 8, ... With a 95-degree dew point, the lowest possible heat index there ...

https://www.chicagotribune.com/news/ct-xpm-2011-12-16-ct-wea-1216-asktom-20111216-story.html

Dec 16, 2011 ... The world's lowest recorded relative humidity value occurred at ... and the dew point was minus 21 degrees producing a relative humidity of 1 ...

https://www.quora.com/What-is-lowest-dew-point-ever-observed-on-earth

Dry industrial nitrogen is typically rated at about 2ppm moisture, which corresponds to a dewpoint of about -70C. The lowest recorded terrestrial temperature is ...

https://www.accuweather.com/en/weather-blogs/weathermatrix/las-vegas-sets-himidity-record-but-its-a-dry-heat/51705

Jun 28, 2011 ... "Las Vegas' largest dew point depression ever recorded was set on June 27, 2011 at 129 degrees. The dew point depression is the difference ...

http://thevane.gawker.com/this-is-why-the-heat-index-is-so-important-1609195413

Jul 23, 2014 ... The dew point is the temperature at which the water vapor in the air will ... is probably the highest heat index ever recorded in the United States.

https://www.wral.com/weather/blogpost/1201076/

Feb 12, 2007 ... MIKE MOSS SAYS: Virginia, The dew point is a reflection of how much water vapor is present in the air, and represents the temperature at ...

http://www.city-data.com/forum/weather/2786442-lowest-relative-humidity-ever-recorded.html

Jul 2, 2017 ... check it out: A World Record Low Humidity? 116°F With a 0.36% Humidity in Iran Well, even here in Mendoza it reached a lower dew point than ...