I used a weather site called visual crossing and it showed a -53F wind chill in ENE Colorado, a -54F in NW Cheyenne County Kansas, and a -54F wind chill near Haigler, Nebraska. This was on February 15th. On February 16th in NE Kansas there was a -51F wind chill NE of Bern, Kansas, a --52F wind chill North of Sabetha, KS, and a -54F wind chill near Dawson, Nebraska. I have never heard of wind chills that cold coming this far South so late in the season. I experienced a -45F wind chill back in 1989 in Central Kansas and that had a very distinctive sting in the air.