Stuart Godwin Jr. in Chestertown noticed that the June 30 relative humidity, reported here on July 1, soared from 51 percent at 1 p.m. to 76 percent at 3 p.m. before falling back. "Did [the] relative humidity actually fluctuate that much?" he asks. It did. BWI reported "light rain" about 3 p.m. The shower added moisture and cooled the air by 9 degrees. Cooler air can't hold as much water, so the RH - moisture relative to the air's capacity to hold it - spiked.
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