0°F was the outside temperature with 40 mph winds (60mph gusts) the time I had to venture to the middle of an empty field to break the ice on water tank with a hatchet so cows could get water.
This was in the Texas Panhandle, temps this low are abnormal. Cows can survive this temps as long as they have adequate feed and water. They can endure high temps pretty well, again as long as they have water.
I guess it depends on the cows