After a few decades of checking wind chill charts and riding in the cold, I don't pay attention to them anymore. I used to have a thermometer with a built in wind chill chart that I took with me.
It seemed more important with the motorcycles, more wind speed, and not as much effort, creating heat.
I think the heat generated by pedaling throws off the calculation of wind chill completely. It's more for someone not being active. Just make sure your skin is not exposed to it.