When relative humidity is at 100%, (such as when dew point temperature and actual air temperature are the same), this means there is a maximum amount of moisture present in the air at that particular ...

Dew point vs. relative humidity The short answer is both terms are different and describe different things about moisture in the air. The dew point is another temperature value.

Humidity doesn’t just make you feel sticky and uncomfortable – it also creates extra dangerous conditions on hot days.

So, when the air cools, the relative humidity rises. That means that a 90 per cent humidity at 25 C and 90 per cent humidity at –10 C would have different amounts of water associated with them.

We tend to measure humidity in terms of Relative Humidity (RH). This looks at how much water vapour there is in the air compared to how much there could be at that temperature.

For example, when the air temperature is 100 degrees Fahrenheit, and the relative humidity is 55 percent, the heat index can shoot up to a sweltering 124 degrees Fahrenheit. And that’s in the shade.

According to the National Weather Service, the dew point is the temperature where the air needs to be cooled to, at constant pressure, in order to achieve a relative humidity (RH) of 100%.