Yes I read that the droughts in some places may actually be caused by the change in wind patterns over the surface of the earth from the turbines. Tehachapi, California has thousands of these turbines and a major drought.
The cooler the air, the lower the humidity.
It is not the wind pattern that is important but the temperature drop. Look at it this way: the windmills generate energy in the form of electricity. the energy is given up by the wind, which is a gas. Remove energy from a gas, and the result is a lowering of gas temperature. Sophomore level of physical chemistry at the school I attended.