Current obs of 79/16 at PIT. 9% relative humidity. Lowest relative humidity ever observed on a 4pm obs at PIT.
If you throw out the 6% at 10am on 7/29/96, which is definitely erroneous, this is now tied for the 2nd lowest relative humidity ever observed at any hour at PIT, behind just the 6pm obs on 3/30/07. I looked at the unrounded csv file and it’s actually a hair lower than the other 9% obs.