In a message dated 12/30/2004 11:17:05 A.M. US Mountain Standard Tim, johnbryan@worldnet.att.net writes: While wind chill may have been for humans, I am of the opinion that such does have an effect on plants. If not I can not fathom the effect on plants of the same species, in the same areas, where some were damaged others not. It was a logical explanation, but perhaps just the fact that there was some protection, (out of the wind) did make a difference. I remember when I took plant physiology 25 years ago one of the things that we learned to do was calculate the boundary layer of undisturbed air at the surface of a leaf at different wind speeds. The layer is thinner at higher wind speed. The boundary layer of undisturbed air slows the transport of water vapor, other gases, and heat. I would think that wind chill is also related to the thickness of the boundary layer. Michael