Or, Upworthy does weather in the imitable National Weather Service style.
For January 2-3 2014 we are looking at a wind chill advisory for the Ann Arbor area with wind chills going all the way past 15 below F. From the NWS Detroit:
Cold overnight temperatures in the single digits below zero will combine with 10 to 15 mph winds to cause dangerous Wind Chill Values of -17 to -23 across all of southeast Michigan. A Wind Chill Advisory has been issued for all of southeast Michigan Tonight through Friday Morning.
On the Ann Arbor Public Schools site, there's a wind chill chart that shows you the combination of wind and cold that sets school policy for indoor recess and for canceling school. Mind you that school doesn't start until Monday January 6 2014.
On days when the temperature and/or wind chill are below 0ºF:
Students will not have recess outside
On days when the temperature and/or wind chill are below -20ºF (20 below zero):
Schools will be closed