Perhaps a moderator with could be persuaded to take a moment to use the "Archive/Move" command at the bottom and move it to Tech Help.
No biggie ... anyway, I think that there will be condensation any time the outside temperature of the surface of the window is cooler than the dew point. According to the Weather Channel, a dew point above 60 deg F is uncomfortable, above 70 deg F is downright muggy.
Solar radiant heating warms up the glass, so hazy or cloudy weather should mean more fogging. I think MB says in the manual that there is always some air going to the defogger, just enough to prevent fogging during rainy weather.
[This message has been edited by Robert W. Roe (edited 09-14-2000).]