I use the Mil Surp Desert Camos for warm weather and switch to wool, either whipcords or heavier wool when it get wet and colder. Been known to hunt in the nylon based lightweights, but they don't do much for me in some of our throny brush. The desert camos, however, take the rough, throny stuff as well as anything that breathes.
Here, when it's warm, it gets really warm. So the heavier pants are not practical. Can be pretty cold in the early AM, down to the 40's and then warm up to the 90's during hunting season.
Haven't had the desert camo Mil Spec stuff wet much. Doesn't get much of it wet with the hard shells I use in conjunction with gaitors. Using capliene underwear also reduces any problems with them getting wet and my getting chilled a long way from my 4WD. E