Typical wind turbines generally cut out when wind speed hits around 30 mph (so operation range is a few mph to 30 mph). Low temperature accessories and design changes are not a real big deal, and most locations do without, as not many problems show up until -20 degrees.
Got a source for that? This says "typically between 45 and 80 mph, most wind turbines cease power generation and shut down." That may be more relevant to residential (tiny) wind turbines. But, 30 MPH? I'm going to say no way that's the case on modern wind farms.
(Help me out here, DungeonMaster. You're the windpower wonk.)
Another big batch of ‘em going up in mid KS. Its gotta get F’n cold up in the wind. And mid July is roasting.