I hate to end a very interesting discussion, but the definitive answer
is below, I have copied 3 definitions of wind chill, and the last
paragraph is from USA Today and discusses wind chill and freezing water:

wind-chill factor (wÄ*nd'chÄ*l')
n.
The temperature of windless air that would have the same effect
on exposed human skin as a given combination of wind speed and air
temperature.

Definition: Wind chill accounts for loss of heat when warm air around
a body is replaced with colder air. The factor is an indication of the
effect of the combination of air temperature and wind speed on human
comfort and safety.

Definition: The wind chill index gives a temperature-like number to
indicate what the current weather conditions would feel like on a calm
day. For example, if the temperature is -5°C and the wind chill is -20,
it means your face will feel as cold as it would on a day when the
temperature was -20°C. The wind chill is only given in a weather forecast
if it is expected to be significant.

from USA today:
Answers archive: Can wind chill alone freeze water
By Jack Williams, USATODAY.com
Q: If the temperature is 38 degrees and the wind chill is 27 degrees, will water on roads freeze?


A: No. Wind chill attempts to account for the effects of wind carrying heat away from your body, or the body of an animal. No matter how hard the wind blows, it doesn't change the air's temperature. You find more on this by going to a USATODAY.com file about Wind chill applies only to people, animals.

Also, you should be aware that whenever the temperature is near freezing, water on roads could freeze because the road is in a colder place than where the temperature was measured. Official temperatures are measured about 4 feet above the ground and the ground or the surface of a road can be two or three degrees colder. In other words, if you hear on the radio that the temperature is 35 degrees, this doesn't mean you don't need to worry about ice on the road. You'll find a lot of useful information by going to our winter safety guide.