By observing a Latitude vs. Humidity Plot, most of the cities are in the range of 60% to 100% humidity. Humidity is a measure of the amount of water vapor in the atmosphere. The higher the temperature, the greater the number of water molecules the air can hold.Humidity is not the same everywhere! It can change each day and is generally different in locations that have different climates. On the interior of continents, where the air is further from oceans and less able to pick up vapor from the sea surface, there is generally lower humidity than places that are near the ocean. Also, because warm air can hold more moisture than cool air, locations with warm climates, such as those near the equator, generally have higher humidity than locations with cooler climates, such as those near the poles