Wind chill is real, but often misunderstood. Wind causes things to lose heat more quickly, but does not make things colder than the actual temperature. When the temperature is 0 degrees Fahrenheit, and the wind is blowing at 10 mph, the wind chill index is -16. However, the air temperature remains 0°F.
An inanimate object exposed to the wind is unaffected by wind chill. A human or animal with exposed skin loses heat more quickly when it is windy. This makes it tough for our bodies to maintain temperature, creating a heightened risk for frostbite and hypothermia.
Your parked car is affected by wind only because wind blows heat away from the engine, causing it to cool down to the actual air temperature faster. However, a car left outside all night will cool to the air temperature anyway, so wind chill has little to do with whether your engine will start in the morning.