Humidity
Humidity to the amount of water vapor in the atmosphere. the quantity of water that the air mass can hold gradually increases over time with the temperature. Saturated air is air mass that is incapable of holding more water vapor. The temperature where saturation is made is known as the dew point (Dew point is the term that most meteorologists use to describe the amount of moisture in the air).
In hot weather conditions, your body's vital strategies are to sweat, which keeps your body cool. However, with high humidity it makes it much more difficult. In hot weather, your heart pumps blood from the body's core to the skin. When the air is dry, your sweat evaporates easily, this takes some of the body's heat with it. The water vapor in the humid air slows the evaporation process, decreasing the cooling effect.
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