That is because the dew point is a measure of how much water vapor is in the air and relative humidity is a measure of how ...

I comment from time to time on how the dew point temperature can be a good guide as to what the coming overnight low temperature might be. A reader wonders if there is such a relationship for relative ...

An e-mail from Herman asks about an instrument using thermometers to determine humidity and wants to know what it is. It's called a sling psychrometer and consists of two thermometers fastened onto a ...