Wind chill is related only to a human's perception of comfort. As John T said, it factors in the evaporative effect of more air moving across exposed skin.
As it relates to machinery (I know a lot of us love our tractors but, honest, they don't feel a thing!), wind can still have an effect.
First and foremost, wind will not in fact chill anything to a point colder than the true temperature of the air. So take a morning where the temp is 10* and the wind chill is -15*. It may chill your bones, but the unheated motor will be no colder than 10*.
Using a block heater . . . In calm air, say it heats the coolant and motor to 85*. Because the wind will strip away the little envelope of warmer air around the, making for a chilling effect, you may find on that same 10* morning, that the heater can only maintain things at 40*.
Running (and this gets to what the truckers describe), it depends on the wind speed, location of tanks and fuel lines . . . If you can get a diesel tractor (farm tractor) running, the warmed bypass fuel in the return line will help warm the fuel in the tank to forestall gelling. And a farm tractor generally moves slow enough that you're not generating a lot of extra wind to strip heat off the fuel heater, or off the warm return lines or the tank, or off the tank(s), and you'll stay running. If the real temperature is low enough to gel your fuel, high winds will have the same effect as running a road tractor at road speeds equivalent to the winds speed, and you run the chance of stripping enough heat away at a higher rate than in calm air. Worst case is that you strip away more heat than than the fuel heater and motor can feed back through the return line to the tank, and your fuel will gel.
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Today's Featured Article - Tractor Proflie: Farmall Model C - by Staff. In 1948 the first Farmall Model C tractor rolled out of the factory and into the farmer's field. A follow-on to the Model B, it was slihtly larger in size but kept the same 113 CID engine and 4-speed transmission. Other upgrades included adjustable rear tire spacing (with sliding hubs), a frame design similar t
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