[Flyin_bryan]

Originally Posted by mhcasey

From a random FAA handout: "Humidity is not generally considered a major factor in density altitude computations because the effect of humidity is related to engine power rather than aerodynamic efficiency."

My meteorology prof used to say something to the effect of, "H20 is a lot smaller than 02 and N2, so moist air is typically less dense."

So does humidity have a significant effect on density altitude, or not?

No