If all the other factors influencing humidity remain constant, at ground level the relative humidity rises as the temperature falls. This is because less vapor is needed to saturate the air, so vapor condenses as the temperature falls. In normal conditions, the dew point temperature will not be greater than the air temperature because relative humidity cannot exceed 100%.[4]
Bill is wanting to go on vacation this summer, and has been looking into difference cities in which to travel too. His two cities that he has been looking at is Phoenix and St. Louis. Bill desperately hates humid temperatures, and is looking to book a city where humidity is the lowest. Bill notices that the average temperatures of Phoenix is about 90 degrees, and St. Louis is about 80 degrees.
Which city will most likely have less humidity levels based on the average summer temperatures?