[thackney]

According to temperature readings from one of the oldest wind farms in the U.S., near Palm Springs, Calif., the turbines make it warmer at night and cooler during the day, generally speaking.

http://www.scientificamerican.com/article/how-wind-turbines-affect-temperature/

“For most regions, the mean temperatures may not change by much because the warming and cooling effects may cancel out,”...

[TexasCajun]

But do the wind turbines disrupt the low-level wind patterns that in turn disrupt the jet stream?

There is a "redistribution" of the earth's kinetic wind energy.

I'm no scientist but this question has intrigued me.