For the last day or so, Chicago has had record-low humidity of all things, with dewpoints below 0°C for much of it:
This is the third day this year and only the 19th day in 142 years dating back to 1871 that the city has officially logged a relative humidity below 20%. At Midway Airport the relative humidity also dropped to 17 percent at 5pm.
This is the lowest relative humidity recorded in Chicago in more than six years since another 17 percent humidity was logged on February 20, 2006.
The other two low humidity days this year were back on April 8 and 9 when the relative humidity dropped to 19%.
Right now the dewpoint of 2°C on a temperature of
26°C gives us a relative humidity around 21%. For comparison, though, in Las Vegas the humidity is about 3%, so we're really not that dry here.