A summer day starts warm and very muggy, with a temperature of 77oF and a dew point at 8 a.m. of 75oF. By afternoon, under sunny skies, the temperature soars to near 95oF, but the dew point falls to 65oF. What most likely led to this decrease in dew point? (assume there was no air mass change - that is, no front moved through the area)
a) The sunshine caused water vapor molecules to condense onto the ground, reducing the moisture content of the air.
b) As temperature increases, the relative humidity decreases, which lowers the dew point.