Below is a table shared by the Centers for Disease Control and Prevention (CDC) that visualizes how higher winds increase the danger of frostbite.
For me, the table reinforces the importance of monitoring wind just as much as temperature during cold months. Add a little wind to 0ºF and your risk of frostbite goes from low to happening within 30 minutes. Add a little wind to -10ºF, and you’re in the 10-minutes-til-frostbite range.
Even after this polar vortex passes, be careful out there and stay warm.
Find more information from the CDC here: Outdoor Winter Safety
Read a little more about cold weather safety in this article I wrote for Travelers Today: How to Weather the Polar Vortex Without Losing a Body Part