Yesterday Mccarran Airport in Las Vegas recorded an incredible dew point depression of 129°! The dew point depression is the difference between the air temperature and the dew point temperature. Here are the observations from KLAS yesterday courtesy of the National Weather Service that confirmed that this was a record for the driest day in Las Vegas.
The relative humidity was 0.63% when the dew point depression reached 129° which is remarkable. The extremely dry air lead to a critically high fire danger but it also meant the heat index was 96° at the time or 11° cooler than the actual air temperature. An interesting experiment if you were on the strip would be to see how fast you dried off after taking a dip in the pool (you’d probably feel pretty chilly too for a minute or so).