The dew point is a key indicator of humidity and is defined as the temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid. A high dew point signifies a greater amount of moisture in the air.
Generally, a dew point above 60°F (15.6°C) is considered high, and it indicates that the air feels humid and sticky. When the dew point reaches 70°F (21°C) or higher, it can feel very uncomfortable, as it significantly reduces the body’s ability to cool itself through sweating. In regions with warmer climates, dew points may frequently rise above this threshold, leading to sweltering summer days.
Understanding dew points can help you gauge how humid it feels outside. For example, if the air temperature is high and the dew point is also high, you can expect oppressive conditions. Conversely, a low dew point, below 40°F (4.4°C), indicates dry air, which can feel quite comfortable.