Originally Posted by tuccillo

As I stated, this combination is rare as it translates to a dewpoint of 87 (which is rare, as the sort of density stratification that this causes is very conducive to thunderstorms in the absence of a strong capping inversion). We occasionally will hit dew points in the low 80s but dew points in the upper 80 occurs in a limited number of locations around the world.

Full disclosure: undergraduate and graduate degrees in atmospheric science, developer of numerical weather prediction models for NASA and the National Weather Service.