https://weatherspark.com/d/19657/9/1/Average-Weather-on-September-1-in-Morgantown-West-Virginia-United-States
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier, and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is generally is followed by a muggy night.
This report illustrates the typical weather in Morgantown, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980, to December 31, 2016.