@Theron posted:No perceptible humidity and 80 degrees today. Can someone explain what a dew-point is? Of course we have no water to drink, but the weather is great!
-=theron
As I understand it, the dew point is the temperature at which water must condense out of the air. Air can hold less and less water as the temperature falls. The temperature cannot fall below the dew point, which often defines the overnight low. That’s why it can get quite cold at night in a desert, even after a triple digit daytime high. This time of year our overnight lows are usually in the low 80s here in Charleston, meaning dew points in the 80s. I know that was a poor explanation, but hopefully it helps.